Eneo Manufacturing Co. appeals from the district court’s judgment against it in favor of Clamp Manufacturing Co. Clamp sued Eneo for trademark infringement of its clamps. Following a bench trial, the district court granted injunctive relief and damages to Clamp. We affirm.
BACKGROUND
Clamp, a California corporation principally located in Los Angeles, manufactures and distributes clamps. Clamp and its predecessor, Saxton Manufacturing Co., have manufactured and distributed cantilevered “C” clamps in various sizes and styles since the early 1950’s. A patent for the clamp, more precisely described as a “single screw actuated pivoted clamp,” was issued in 1955 and expired in 1972. 1 In January 1974, Clamp obtained a trademark registration, valid for twenty years, for the term “KANT-TWIST.” No. 977,118, Principal Register, U.S. Patent Office (noting 1954 as date of first use of clamp).
Eneo, an Illinois corporation principally located in Chicago, manufactures and distributes machine tools, parts, and accessories. Colex, Inc., the additional defendant-appellant, was a California corporation principally located in Los Angeles and the wholly-owned West Coast subsidiary of Eneo. Colex was merged into Eneo following trial.
In 1976 or early 1977, Eneo began purchasing and distributing a line of cantilevered “C” clamps manufactured in Korea. The clamps were virtually identical to the Kant-twist clamps manufactured by Clamp and were designated as “Eneo NO-TWIST clamps” in the Eneo sales catalog.
*514 In November 1977, Clamp wrote Eneo demanding that Eneo cease selling its No-twist clamps, because Enco’s clamps were confusingly similar to Clamp’s Kant-twist clamps. Eneo refused, stating that the Clamp patent had expired and the “no-twist” term was used descriptively. In December 1977, Clamp again asked Eneo to cease marketing its No-twist clamps; Eneo did not respond.
Following the exchange of correspondence, Clamp took several actions in response to Enco’s efforts. In May 1978, Clamp filed a complaint with the Federal Trade Commission, alleging the palming off of confusingly similar copies of its clamps by several wholesale distributors, including Eneo. Clamp attempted to persuade its customers, through advertising and direct contacts, that its products were superior to those of Eneo, and made changes to the appearance of some parts of its clamps. Clamp also sought incontestable status for its Kant-twist mark, including filing a required affidavit with the U.S. Patent Office stating that no litigation concerning its mark was pending.
See
15 U.S. C. § 1065(2). Subject to certain exceptions, incontestable status provides the mark with a conclusive presumption of validity and prevents a defense to infringement on the grounds that the mark is merely descriptive.
See Park ‘N Fly v. Dollar Park & Fly, Inc.,
In August 1982, after the FTC decided to take no action on Clamp’s complaint, Clamp filed suit against Eneo, Colex, and seven other machine tool supply companies, alleging infringement of its registered Kant-twist trademark, in violation of 15 U.S.C. § 1114(1) (§ 32(1) of the Lanham Act); infringement of its configuration trademark, false designation of origin, false description, and false representation, in violation of 15 U.S.C. § 1125(a) (§ 43(a) of the Lan-ham Act); and unfair competition and infringement of trademark rights under California law. The claims against the seven other defendants were withdrawn prior to the trial in October 1986. On August 10, 1987, Findings of Fact and Conclusions of Law were entered in favor of Clamp.
Clamp Mfg. Co. v. Enco Mfg. Co.,
5 U.S.P. Q.2d 1643 (C.D.Cal.1987) [
STANDARD OF REVIEW
The district court’s decision denying laches is reviewed for abuse of discretion.
Russell v. Price,
*515 DISCUSSION
A. Laches
Eneo argues that laches bars Clamp’s recovery of monetary damages; Eneo does not argue that laches also bars the injunctive relief granted by the district court. We recognize estoppel by laches as a valid defense to an infringement action on behalf of an incontestable trademark.
Pyrodyne Corp. v. Pyrotronics Corp.,
The district court made no express findings or conclusions on Enco’s laches defense. This court may assume that the district court’s failure to discuss the laches defense is equivalent to a refusal, because there is no doubt that (1) the district court rejected the defense, and (2) a full understanding of the issue may be obtained from the district court’s findings, which did address the relevant factors.
See Vance v. American Hawaii Cruise, Inc.,
Eneo argues that injury to it should be presumed if the waiting period exceeds that of the analogous statute of limitations period. Other circuits have applied such a presumption to reject a defense of laches when the delay period is less than the analogous statute of limitations.
See Ambrit, Inc. v. Kraft, Inc.,
B. Validity of the Clamp Configuration Trademark
The physical details and design of a product may be protected under the trademark laws only if they are nonfunctional and have acquired a secondary meaning.
Vuitton Et Fils S.A. v. J. Young Enter
*516
prises,
1. Functionality
The requirement of nonfunctionality is based “on the judicial theory that there exists a fundamental right to compete through imitation of a competitor’s product, which right can only be
temporarily
denied by the patent or copyright laws.”
In re Morton-Norwich Products, Inc.,
The district court found that Kant-twist clamps were distinctive, primarily nonfunctional, and arbitrary, and that commercially feasible alternative configurations exist. Clamp presented evidence of alternative designs and of the arbitrary nature of the clamp arm’s shape, including the fact that Clamp made minor design variations in response to the competition from Eneo. It also introduced expert testimony concerning a hypothetical design, and evidence of the existence of a non-identical German-made clamp. We therefore cannot find that the district court findings are clearly erroneous, even though another fact-finder could have reached the opposite conclusion.
We recognize that considerable support exists for a determination of functionality. Two of the factors cited in
Morton-Norwich
weigh strongly in Enco’s favor. An expired utility patent exists and Clamp’s advertising has heavily, if not exclusively, touted the utilitarian aspects of its product. The clamp is not designed in any arbitrary or distinctive manner, with the exception of minor variations in the shape of the clamp arms. Evidence shows that consumers purchased the product on the basis of its function. No evidence was presented that purchasers were aware of Clamp’s design variations. Nor does the copying by Eneo lessen the necessity for Clamp to prove its configuration nonfunctional.
See Vibrant Sales, Inc. v. New Body Boutique, Inc.,
2. Secondary Meaning
A product configuration has secondary meaning if the purchasing public associates that configuration with a particular source.
See Fuddruckers,
Evidence of use and advertising over a substantial period of time is enough to establish secondary meaning.
See First Brands v. Fred Meyer, Inc.,
We recognize Enco’s arguments for overturning the determination of secondary meaning. No evidence concerning the views of actual purchasers was presented.
Cf. Levi Strauss,
C. Infringement
1. Likelihood of Confusion
If Clamp is successful in establishing that its product configuration is entitled to trademark protection under 15 U.S. C. § 1125(a) by proving nonfunctionality and secondary meaning, it must then prove that Enco’s use of a similar configuration is likely to confuse consumers.
See Fuddruckers,
We apply a similar analysis to Clamp’s claim under 15 U.S.C. § 1114(l)(a) that its registered mark was infringed by Enco’s use of the term “no-twist.”
See Beer Nuts, Inc. v. Clover Club Foods Co.,
2. Fair Use
Enco’s fair use defense must satisfy one of the elements of 15 U.S.C. § 1115(b) (§ 33(b) of the Lanham Act). Eneo relies on § 1115(b)(4), which allows the use of a term “which is descriptive of and used fairly and in good faith only to describe to users the goods_” The district court’s finding that Eneo used the term “no-twist” as a trademark is supported by substantial evidence. The district court was not clearly erroneous in rejecting the fair use defense.
3. Additional Claims
Clamp also asserted a claim under the false representation/unfair competition prong of 15 U.S.C. § 1125(a).
See
2 McCarthy,
supra,
at 344, 364-68 (two prongs of § 43(a) of Lanham Act). The district court concluded that Eneo violated the false representation/unfair competition prong. Clamp has proved that confusion is likely. The fact that Eneo labelled its clamps with its name does not outweigh Enco’s conduct in copying the exact sizes of the Clamp product line and Clamp’s promotional materials, given the broad protection provided by this portion of the statute.
See Smith v. Montoro,
CONCLUSION
We uphold the district court’s implied rejection of the laches defense as properly within its discretion, although the findings and conclusions should have addressed more directly this potentially valid defense. The district court’s determinations that Clamp possesses a valid product configuration trademark and that Eneo engaged in false representation are not clearly erroneous.
AFFIRMED.
Notes
. The district court found that the patent expired in December 1975. Eneo asserted that the patent expired in 1972. That statement is supported by testimony from the head of Clamp, Philip Saurenman. Patents have a term of 17 years beginning the day after the patent is issued. 35 U.S.C. § 154;
Ballard & Ballard Co.
v.
Borden Co.,
. Because application of the presumption of injury would not matter to the result here, we do not decide whether injury should be presumed if the delay in filing a trademark infringement suit exceeds the period of the analogous statute of limitations.
