Harrington Manufacturing Company (Harrington), appeals on certification from a December 26, 1985 decision of the United States District Court for the Eastern District of North Carolina, allowing partial summary judgment in favor of appellee,
Powell Manufacturing Company (Powell)
I.
The application for the Pickett patent was filed on October 2,1967 and is directed to a mechanized tobacco harvester that, unlike its predecessors, has a swinging head. This feature enables the machine to accommodate tobacco stalks that are out-of-line or doglegged. 1 Unrefuted evidence was presented to the District Court that Pickett, one of its three inventors, demonstrated a prototype of the harvester to Osborne, a leading agricultural journalist, sometime in September 1966. Osborne then published an article in the Charlotte Observer on September 26, 1966 which reported that “the machine lumbered through a tobacco field, getting every height to which the defoliators were adjusted.” This was found to be a public use more than a year prior to the filing of the patent application.
Harrington cites two reasons why the District Court erred when it granted appel-lees summary judgment: first, that the harvester was still experimental and not yet reduced to practice when Pickett demonstrated it to Osborne in late September 1966; and, second, that the District Court improperly imposed upon appellant a special burden of persuasion by requiring it to come forth with “clear and convincing evidence” that the demonstration was experimental, and therefore not a public use under § 102(b).
II.
In support of its position that the Osborne demonstration was merely an experimental use of the harvester and thus outside § 102(b), Harrington notes that tobacco leaves ripen from the bottom of the stalk upward toward the top, necessitating that a single tobacco plant be harvested in three or four passes throughout the growing season. It is said, therefore, that since the Osborne demonstration did not take place until late in the season, only the top leaves remained on the plants, the lower leaves having been harvested earlier in the season. While appellant concedes that the harvester performed satisfactorily on the upper leaves during the demonstration, it urges that at the time it was impossible to determine whether the harvester would perform satisfactorily on the lower leaves. Appellant says that it was not until January 1967, when the harvester was taken to Florida and was used to harvest lower leaves of tobacco, that the harvester was finally reduced to practice.
This court will affirm a District Court’s grant of summary judgment when the record below reveals no genuine issue as to any material fact. Fed.R.Civ.P. 56(c).
See Lemelson v. TRW, Inc.,
This court held in
In re Brigance,
It is immaterial that Mr. Harrington, one of the other inventors, offered evidence that he was uncertain whether the harvester would operate. Pickett’s purpose was sufficient to show that he, as one of the joint inventors, intended to exploit the harvester for a commercial purpose. 4 Any of the inventors was free to make, use, or sell the invention in the absence of an agreement to the contrary. 35 U.S.C. § 262.
Also, the fact that minor modifications were made and a third prototype built subsequent to the Osborne demonstration does not raise a material issue of fact in this instance. The prototype that Pickett demonstrated to Osborne clearly fell within the scope of claim 8 of the Pickett patent. As one of our predecessor courts held in
In re Theis,
There is no requirement that an invention function perfectly in order to be reduced to practice or considered as on sale or in public use. All that is necessary is that the invention be commercially operable; it may have problems which are not due to ‘fundamental defects.’ National Biscuit Co. v. Crown Baking Co.,105 F.2d 422 , 424,42 USPQ 214 , 215 (1st Cir.1939).
Finally, we do not conclude that appellant’s asserted uncertainty that the harvester would satisfactorily harvest lower leaves of the tobacco plant raises a genuine issue of fact in this instance. Claim 8 of the Pickett patent is a broad claim and does not require that lower leaves of tobacco be harvested; rather, claim 8 reads on a device that removes leaves from part of the tobacco stalk. When Pickett demonstrated the harvester to Osborne in September 1966, claim 8 unequivocally had been reduced to practice.
*1482 III.
Appellant also argues that the District Court improperly imposed a special burden on Harrington by requiring it to prove by “clear and convincing evidence” that the Osborne demonstration was experimental and outside § 102(b). As this court has previously held, under 35 U.S.C. § 282, the burden of proving invalidity always remains with the party asserting invalidity; the burden never shifts to the patentee.
Stratoflex, Inc. v. Aeroquip Corp.,
Nevertheless, even in summary judgment proceedings, once an alleged infringer has presented sufficient facts to establish a
prima facie
case of public use, it is incumbent on the patentee to come forward with
some
evidence that there is a genuine issue of material fact in dispute.
Barmag Barmer Maschinenfabrik AG, v. Murata Machinery, Ltd.,
AFFIRMED.
Notes
. The concept of the floating head is embodied in claim 8 of the Pickett patent, the claim at issue in these proceedings.
. This follows our decision in
TP Laboratories v. Professional Positioners, Inc.,
. Contrary to appellant's insistence that appellant’s subjective intent creates a factual issue in this case, we conclude that an inventor's subjective intent is immaterial when objective evidence points otherwise. As this court stated in
In re Smith,
. There was nothing in the proceedings from Pickett himself as to his alleged experimental purpose.
. We doubt whether the District Court actually held appellant to the "clear and convincing evidence” standard, even though the decision below specifically refers at one point to this increased burden. In reviewing the opinion below, we consider it likely that the court below did not actually use the “clear and convincing evidence" standard but based its opinion on the fact that appellant failed to meet its burden of going forward with any evidence to show that the use was an experimental use.
