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CONDENSER DEV. CORP. v. MONTGOMERY WARD & CO.

July 23, 1936

CONDENSER DEVELOPMENT CORPORATION
v.
MONTGOMERY WARD & CO.



The opinion of the court was delivered by: INCH

INCH, District Judge.

Plaintiff sues for alleged infringement of a patent granted to Cramer, No. 1,800,719, April 14, 1931, and also a patent granted to Tompkins, No. 1,932,328, October 24, 1933.

The Cramer patent relates to an electrical condenser and the Tompkins patent relates to a frame construction of such a condenser. Plaintiff sues on claims 4, 11, 17, and 18 of the Cramer patent, which more specifically relates to a ball-bearing construction, and claim 20, which relates to a stator support.

 As to the Tompkins patent plaintiff sues on claims 1, 4, and 5.

 The above claims are as follows:

 Cramer Claims.

 "4. An electrical condenser having a frame with end support members, a plurality of groups of stator plates carried by said frame and a rotatable system including a shaft carried by said support members and carrying a plurality of groups of rotor plates corresponding in number to and for cooperation with the groups of stator plates, said end support members having seats formed therein for anti-friction bearing members, said shaft having an annular groove near its drive and to receive and hold said anti-friction bearing members in the seat in the front end support member, said shaft also having its inner end formed into a bearing race to cooperate with the seat in the rear end support plate to receive anti-friction bearing members, means on the rear end support member to hold the shaft and bearing members in working position, a brace plate between at least two groups of stator plates, and an adjustable device carried on said brace plate and engaging a part of the rotatable system for applying a desired amount of friction to said rotatable system."

 "11. An electrical condenser having a frame with end support members, a plurality of groups of stator plates carried by said frame, a shaft carrying groups of rotor plates for cooperation with said stator groups, said shaft being supported by said end support members, means for reducing to a minimum frictional resistance between the shaft and said end support members, said means comprising ball-bearing races positioned on said end support members and cooperating races formed in said shaft with balls in said races; a cover plate for at least one of said pair of races to hold the shaft races and balls in working position, and adjustable means for applying a desired amount of friction to said shaft."

 "17. For an electrical condenser having; a frame with end support members, a plurality of groups of stator plates carried by said frame, a rotatable system comprising a shaft supported by said end support members and carrying groups of rotor plates for cooperation with said stator groups of plates; means for specially supporting said sfaft on said end support members, said special means consisting of, a race-way carried by each end support, and cooperating race-ways in the shaft with anti-friction members in said race-ways, and adjustable means for applying to the rotatable system a desired amount of friction.

 "18. An electrical tuning device including a frame with end support members, a plurality of groups of stationary tuning members carried by said frame, a movable system comprising a shaft supported by said end support members and carrying groups of tuning elements for cooperation with said stationary tuning elements; means for specially supporting said shaft on said end support members, said special means consisting of, a race-way carried by each end support, and cooperating race-ways in the shaft with anti-friction members in said race-ways, and means for applying to the movable system a desired amount of friction."

 "20. A variable condenser including; end support members, frame parts mechanically connected to and between said members and having portions extending upwardly on opposite sides of the condenser and having openings formed therein, supporting tie bars, stator plates secured to said bars, and a single flat strip of insulation connected between each of said bars and said frame parts, said strips of insulation being secured at a single end to said upwardly extending portions of the frame parts and extending into said openings and connected at the other end to said supporting tie bars exposed by said openings."

 Tompkins Patent.

 "1. A condenser construction including stator plates, rotor plates interleaved therewith and spaced therefrom, a rotor plate shaft and a non-warping frame for maintaining the spacing between said rotor plates and stator plates, said frame comprising a stamping providing a bottom having an opening and opposed sides folded therefrom and forming with said bottom a channel member, shaft supporting plates secured to said channel member at opposite ends thereof, said rotor plates being carried by said shaft and means carried by the channel member for supporting said stator plates between said opposed folded sides."

 "4. A condenser construction including stator plates, rotor plates interleaved therewith and spaced therefrom, a rotor plate shaft and a non-warping frame for maintaining the spacing between said rotor plates and stator plates, said frame comprising a stamping providing a bottom and opposed sides folded therefrom and forming with said bottom an open ended channel member, separate shaft supporting plates secured to said channel member at opposite ends thereof, said rotor plates being carried ...


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