Collins Licensing, L.P., Plaintiff/cross-Appellant v. American Telephone and Telegraph Company

11 F.3d 1072, 1993 U.S. App. LEXIS 35958
CourtCourt of Appeals for the Federal Circuit
DecidedNovember 5, 1993
Docket92-1201
StatusUnpublished

This text of 11 F.3d 1072 (Collins Licensing, L.P., Plaintiff/cross-Appellant v. American Telephone and Telegraph Company) is published on Counsel Stack Legal Research, covering Court of Appeals for the Federal Circuit primary law. Counsel Stack provides free access to over 12 million legal documents including statutes, case law, regulations, and constitutions.

Bluebook
Collins Licensing, L.P., Plaintiff/cross-Appellant v. American Telephone and Telegraph Company, 11 F.3d 1072, 1993 U.S. App. LEXIS 35958 (Fed. Cir. 1993).

Opinion

11 F.3d 1072

28 U.S.P.Q.2d 1847

NOTICE: Federal Circuit Local Rule 47.6(b) states that opinions and orders which are designated as not citable as precedent shall not be employed or cited as precedent. This does not preclude assertion of issues of claim preclusion, issue preclusion, judicial estoppel, law of the case or the like based on a decision of the Court rendered in a nonprecedential opinion or order.
COLLINS LICENSING, L.P., Plaintiff/Cross-Appellant,
v.
AMERICAN TELEPHONE AND TELEGRAPH COMPANY, Defendant-Appellant,

Nos. 92-1201, 92-1294 and 92-1302.

United States Court of Appeals, Federal Circuit.

Nov. 5, 1993.

W.D.Tex.

VACATED AND REMANDED.

BEFORE NIES, Chief Judge, PLAGER, Circuit Judge, and COHN, District Judge.*

PER CURIAM.

Collins Licensing, L.P., sued American Telephone and Telegraph Company (AT & T) in the District Court for the Western District of Texas for infringement of U.S. Patent No. 3,956,593 ('593 patent). After a jury trial, judgment was entered against AT & T in accordance with special verdicts that claims 29, 34, 37-39, 43 and 47-48 are not invalid and that AT & T had infringed only claim 29 of the asserted claims. The court further ruled that the patent was not unenforceable. Both parties appeal, seeking reversal of the rulings adverse to their positions. AT & T also appeals from the order of the district court holding it in contempt. Because we conclude that claim 29 is invalid and that the verdicts of non-infringement of the other asserted claims cannot be overturned, we reverse the judgment of liability. We vacate and remand for reconsideration of the contempt order.

I.

Validity of Claim 29

AT & T contends that three prior art references render claim 29 obvious. The first, A. Mack & B. Patrusky, Time Division Digital Switch Matrix Technique Evaluation, in IEEE International Conference on Communications 40-1 (June 1972), evaluates four different digital switch architectures for cost, reliability and grade of service. Another prior art reference, Guido Granello, Switching Networks for PCM Time Division Exchanges, in International Switching Symposium Record 81 (June 1972), analyzes the optimal switching configuration for tandem PCM exchanges.1 The final piece of prior art, Rome Air Development Center, Final Technical Report RADC-TR-72-27, Integrated Circuit/Message Switch Feasibility Model Development, Test, and Evaluation (1972) (hereinafter "Final Technical Report") consists of several volumes of technical reports on digital telephony. Because we hold that claim 29 would have been obvious, if not fully anticipated by the prior art, we agree that the district court erred by failing to grant AT & T's motion for judgment as a matter of law.

Claim 29, the only claim the jury found infringed by AT & T, provides:

The switch of claim 27, wherein said individual time division digital signal switch element means are in two basic configurations, a space switch eleme[n]t and a time switch element interconnectable in pluralities of each said space and time switch elements through an extensive range of time division multiplex switch sizes and configurations.

The claim from which Claim 29 depends, Claim 27, was cancelled by the PTO during reexamination and thus cannot independently serve as a basis for infringement. Collins does not argue here that claim 27 is itself patentable over the aforementioned prior art. Claim 27 reads:

In a switch for interconnecting between data incoming and outgoing digital time division multiplex communications lines:

individual time division digital signal switch element control means, including,

control store means for storage of the status of interstage links in a switch;

cyclic retrieval means connected to said control store means for cyclic retrieval of stored status information from said control store means;

control data source means interconnected with said control store means for interrogating and modifying information stored in said control store means;

and step said control signal input means to said control store means for activating information retrieval and modification.

Claim 29 differs from claim 27 in that claim 29 adds a modular switch architecture. The dispute of the parties concerns whether the prior art teaches this modular architecture, i.e., a digital telephone switch with individually controlled, distinct time and space switch components. Both the inventors during prosecution of the '593 patent, and Collins during the subsequent reexaminations, stressed the invention's use of standardized, individually controlled time and space switch components, which allow for flexibility in switch implementation. The specification of the '593 patent states that:

It is ... a principal object of this invention to provide a time space time (TST) switch system achieving significant improvements in operation and in minimized equipment costs, in using two basic modules, a time switching module and a space switching module....

Another object is to provide such a TST switch system wherein the two basic modules may be interconnected to realize virtually any size and configuration of a time division switch.

Collins later indicated that the patented invention employed "the ingenious and novel modularization of the time and space switch elements, associating individual control stores with each element." Request for Reexamination at 9 (June 21, 1989) (emphasis added).

Our examination of the prior art reveals that both Granello, supra, and the Final Technical Report, supra, teach individual space and time switch modules. Where depicting "[t]he graph representation of a three-stage network" in Figure 5, Granello, supra at 84, plainly illustrates that each stage is composed of multiple discrete components. While these modules are interconnected within a stage, and are further connected to other components in other stages, they are individually controlled, distinct modules. Granello explains that "[t]he graphs shown in Fig. 5 can be implemented as follows: i) Time-space-time (TST) implementation. Stages 1 and 3 are made up of time matrices, stage 2 is a space matrix." Id. at 85. Where the Final Technical Report refers to the three stages of the TST switch, it indicates that "different primary, secondary and tertiary stages should be package[d] [sic] on separate modules ... [with] any given primary, secondary or [sic, tertiary] function including control ... packaged wholly on one to three cards...." 3 Final Technical Report at 92. All three references further teach the advantages of a modular design, allowing flexible implementation of switches through different space and time switch combinations. Both Mack & Patrusky, supra at 40-5, and Granello, supra at 87, further provide data on cost, reliability and other factors for different sizes of differently configured switches. See also 3 Final Technical Report, supra at 92.

The additional limitations of claim 29 are taught within the prior art references.

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11 F.3d 1072, 1993 U.S. App. LEXIS 35958, Counsel Stack Legal Research, https://law.counselstack.com/opinion/collins-licensing-lp-plaintiffcross-appellant-v-american-telephone-cafc-1993.