Wesley-Jessen Division of Schering Corporation (“Wesley-Jessen”) appeals from the district court’s granting of a preliminary injunction enjoining it from using designations that Bausch & Lomb, Inc. (“Bausch & Lomb”) claims are its trademarks. For the reasons below, we affirm.
I
Wesley-Jessen and Bausch & Lomb both manufacture soft contact lenses. In 1977, Bausch & Lomb introduced a spin cast, ultrathin soft contact lens with a diameter of 13.5 mm and a water content of approximately 38%. That lens was denominated U3, indicating its ultrathin thickness and its 13.5 mm diameter. In 1979, Bausch & Lomb introduced the U4, with a 14.5 mm diameter. These lenses proved very popular and were marketed with considerable success.
In 1980, Wesley-Jessen made its entry into the ultrathin market with its lathe cut “Gold Label” lens, which had a water content of approximately 30%. These lenses did not sell well. In August 1981, WesleyJessen introduced its Durasoft 2 line of ultrathin lenses with a water content approximating that of the Bausch & Lomb product. In its marketing efforts, WesleyJessen used the designations U3 and U4, it contends, to indicate thickness and diameter. Unlike the Gold Label lenses, these new lenses sold briskly.
On December 18, 1981, Wesley-Jessen filed a complaint seeking a declaratory judgment that its use of the designations U3 and U4 did not constitute trademark infringement or unfair competition. Bausch & Lomb counterclaimed, alleging, inter alia, that Wesley-Jessen’s use of U3 *864 and U4 is a false designation of origin or a false representation in violation of 15 U.S.C. § 1125(a). Bausch & Lomb moved for a preliminary injunction enjoining Wesley-Jessen from using U3 and U4 in conjunction with its lenses. In July 1982, after an evidentiary hearing, the district court enjoined Wesley-Jessen from using those designations or any confusingly similar designations in selling, distributing or promoting its contact lenses. The district court granted a limited stay to allow Wesley-Jessen to develop alternative sales and marketing techniques.
Wesley-Jessen appealed from the order granting a preliminary injunction. A panel of this court extended the stay through the first week in November when oral arguments were heard. The stay was then extended until the date of entry of this decision and order.
II
Wesley-Jessen contends that the district court abused its discretion in granting a preliminary injunction. Wesley-Jessen argues that the court erred first, in relying on certain treatises not in evidence in evaluating the market surveys the parties offered; second, in determining that Bausch & Lomb would likely succeed in its case on the merits; and third, in determining that the equities of the situation weighed in favor of granting a preliminary injunction.
III
Decisions to grant or deny preliminary injunctive relief are addressed to the sound discretion of the district court, and appellate review of such a decision is limited.
American Hospital Association v. Harris,
(1) whether the plaintiff will have an adequate remedy at law or will be irreparably harmed if the injunction does not •issue;
(2) whether the threatened injury to the plaintiff outweighs the threatened harm the injunction may inflict on the defendant;
(3) whether the plaintiff has at least a reasonable likelihood of success on the merits; and,
(4) whether the granting of a preliminary injunction will disserve the public interest.
O’Conner v. Board of Education,
The only issue before us at this preliminary stage is whether the district court abused its discretion; we do not decide the ultimate merits of the case.
See Kolz v. Board of Education,
A
Wesley-Jessen contends that the district judge erred in relying on certain treatises provided by Bausch & Lomb in analyzing the market survey data submitted by both parties. Each party had conducted a survey and had presented a survey expert at the evidentiary hearing. The district judge asked both experts to recommend literature to assist her in evaluating the surveys. Bausch & Lomb’s expert recom *865 mended two books. Neither Wesley-Jessen’s expert nor its counsel made any objection to this recommendation, and when given an opportunity, neither made any alternative recommendation. Bausch & Lomb arranged to have the books delivered to the judge and notified Wesley-Jessen of the delivery. Again no objection was made at the time of the delivery of the books. The judge used the books as background reference in analyzing the market surveys and ultimately concluded that Bausch & Lomb’s survey was sound.
According to Wesley-Jessen, the district court’s actions violated Rule 201 of the Federal Rules of Evidence, which allows a court to take judicial notice only of adjudicative facts that are generally known within the territorial jurisdiction of the court or that are capable of accurate and ready determination by resort to sources whose accuracy cannot reasonably be questioned. WesleyJessen contends that the court, by relying on books not in evidence, in effect took judicial notice of the contents, which did not qualify for Rule 201 notice.
We do not regard the district judge’s actions as taking judicial notice of the contents of the books. Judicial notice is based on the concept that there are certain facts or propositions which will be taken as true without requiring a party to prove them with evidence. See 9 Wigmore on Evidence § 2565 (Chadbourn rev. 1981). Judicial notice, in essence, is a substitute for evidence. The district judge did not use the books as a substitute for evidence, but rather as background information to help her interpret the evidence before her. This she did in an unbiased, open, and evenhanded manner. In open court, she solicited from both parties recommendations for reference materials. Wesley-Jessen knew precisely which reference works the judge would be considering and neither its expert nor its counsel made any objection until after the judge had made her decision. It is too late now for Wesley-Jessen to complain about the judge’s use of the books.
B
Wesley-Jessen next asserts that the district court erred in assessing Bausch & Lomb’s likelihood of success on the merits. The district court concluded that Bausch & Lomb would likely establish that U3 and U4 are protectible trademarks because they had acquired secondary meaning. The court further preliminarily concluded that there is a likelihood of confusion between the parties’ lenses with such designations and that Wesley-Jessen was infringing on Bausch & Lomb’s trademark rights in using U3 and U4 as series designations.
It appears undisputed that U3 and U4 originated as merely descriptive terms and are protectible trademarks only if they have acquired secondary meaning denoting the source of the lenses.
See Miller Brewing Co. v. G. Heileman Brewing Co.,
On the issue of secondary meaning, Wesley-Jessen first disputes the district court’s interpretation of the market survey data submitted by both parties. Bausch & Lomb’s market survey indicated that 96.7% of eye care professionals named Bausch & Lomb as the source of U3 and U4 lenses. Wesley-Jessen’s market survey showed that only 7.7% said that U3 and U4 were brand names as opposed to sizes. Each party had its own survey expert to interpret the data and each party had an opportunity to recommend background reference materials to *866 the court. The court ultimately credited the Bausch & Lomb survey and rejected the Wesley-Jessen survey.
The district court’s decision is soundly based. The key question in the Wesley-Jessen survey asks whether certain designations are brands or sizes. The answers are of little guidance, because even if those who responded thought of U3 and U4 as sizes as opposed to “brands,” those designations could still have secondary meaning if they were also associated with a single source.
Cf. Ideal Industries v. Gardner Bender, Inc., supra,
Wesley-Jessen also challenges the district court’s evaluation of other evidence on the issue of secondary meaning. It is undisputed that Bausch & Lomb was the first manufacturer to use U3 and U4 in connection with its lenses. Wesley-Jessen did not use U3 and U4 for its ultrathin Gold Label series, but instead used those designations only when it produced a product of approximately the same water content as the Bausch & Lomb lenses. Of approximately thirteen manufacturers of ultrathin soft lenses other than Bausch & Lomb, none save Wesley-Jessen uses U3 and U4 to designate size. One manufacturer, in fact, used U4 as a synonym for the Bausch & Lomb lens in an advertisement aimed at eye care professionals. That advertisement was captioned: “CSI vs U4 ... Syntex’s new soft lens challenges B & L ... . ” While our chief focus is the attitude of purchasers toward the designations, id. at 1023, the view of this competitor in an advertisement aimed at the common pool of lens purchasers indirectly illustrates the attitude of these purchasers. To promote effective communication, an advertiser like Syntex tries, no doubt, to use terms in the same manner as its target market does. Thus Syntex’s use of the term U4 reflects the market’s understanding of the term. Additionally, Syntex’s use of the term reinforces the term’s unique association with Bausch & Lomb in the minds of the lens purchasers. The district court’s preliminary finding of secondary meaning is amply supported by the evidence.
Wesley-Jessen disputes the district court’s preliminary finding of likely confusion between the parties’ products. Since the market for these lenses is composed of eye care professionals, and since a prescription for the Wesley-Jessen lens requires a piece of information (base curve) not required by a Bausch & Lomb prescription, Wesley-Jessen maintains that there is no danger of confusion.
“In determining whether likelihood of confusion exists, courts consider such factors as the type of trademark in issue, the similarity of design, similarity of products, identity of retail outlets and purchasers, identity of the advertising media utilized, [the alleged infringer’s] intent, and actual confusion.”
Union Carbide Corp. v. Ever-Ready Inc.,
As with other factual determinations, the district court was faced with conflicting evidence and had to decide which evidence to credit. The district court set out in its opinion the evidence on which it relied in concluding that there is a likelihood of confusion. Having reviewed and considered this evidence and the countervailing evidence advanced by Wesley-Jessen, we cannot say that the district court’s finding of likelihood of confusion is clearly erroneous. The evidence shows identical designations used on nearly identical products sold to *867 identical markets through identical advertising media. Additionally, one affidavit, credited by the court, describes an incident of actual confusion: one customer mistakenly returned nineteen lenses in WesleyJessen vials labeled U3 and U4 to Bausch & Lomb.
Wesley-Jessen disputes the district court’s preliminary finding of intent to trade on Bausch & Lomb’s good will. Such intent is one factor to consider in assessing likelihood of confusion, but it is not a necessary factor.
See Tisch Hotels, Inc. v. Americana Inn, Inc.,
Having concluded that Bausch & Lomb had established that it would likely prevail on the issues of secondary meaning and likelihood of confusion, the district court acted well within its discretion in finding that Bausch & Lomb was likely to succeed on the merits.
C
Wesley-Jessen maintains that, even if Bausch & Lomb has established likely success on the merits, the other factors the court must consider in the context of interlocutory relief militate against granting a preliminary injunction.
Wesley-Jessen disputes the district court’s finding of irreparable harm, stating that Bausch & Lomb has lost no sales or market share and that Bausch & Lomb’s reputation is in no danger because WesleyJessen’s lenses are of high quality. These arguments miss the mark. Courts readily find irreparable harm in trademark infringement cases because of the victim’s inability to control the nature and quality of the infringer’s goods,
Ideal Industries v. Gardner Bender, Inc., supra,
Wesley-Jessen contends that the balance of hardships between the parties militates against granting a preliminary injunction. Even where irreparable harm has been shown, the district court must consider the relative hardship to the parties in its decision to grant or deny preliminary relief.
Ideal Industries v. Gardner Bender, Inc., supra,
Wesley-Jessen finally argues that the public interest is not served by the granting of the preliminary injunction be
*868
cause Wesley-Jessen’s lenses pose no health hazard. Again, Wesley-Jessen’s argument misses the mark. The question is not whether the public interest will be served, but whether the public interest will be
dis
served.
See O’Conner v. Board of Education, supra,
IV
The district court properly considered the four factors for preliminary injunctive relief and concluded that an injunction should issue. The district court did not abuse its discretion in so deciding. Therefore the stay granted by this court on November 4, 1982 is terminated and the order of the district court is affirmed.
