Harold C Simpson

US Patent:

6399880, Jun 4, 2002

Filed:

Aug 8, 2000

Appl. No.:

09/633457

Inventors:

Paul S. Bedrosian - Andover MA
David C. Wojewoda - Londonderry NH
Harold Allan Simpson - Andover MA
James L. Brandner - Haverhill MA

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

H05K 900

US Classification:

174 35GC, 174 35 R, 361816, 361818

Abstract:

An electromagnetic interference (EMI) shielding system includes one or more electrically conductive gaskets placed between electronic circuit cards in a card rack. The conductive gaskets are affixed to circuit cards to form a conductive shield, at the end of the card rack that is nearest the door of the cabinet in which the card racks are mounted. A gasket is attached to each circuit card within a rack, the gasket âfillingâ the space between the faceplates of two adjacent circuit cards.

US Patent:

40064379, Feb 1, 1977

Filed:

Jun 27, 1975

Appl. No.:

5/590901

Inventors:

Harold A. Simpson - North Andover MA
Edwin C. Thompson - West Epping NH

Assignee:

Bell Telephone Laboratories, Incorporated - Murray Hill NJ
Western Electric Company, Inc. - New York NY

International Classification:

H03H 708
H03H 902

US Classification:

333 72

Abstract:

A band-pass filter comprising a plurality of coupled electromechanical filters is disclosed. Each electromechanical filter has a frequency pass-band centered about a fundamental frequency and a plurality of higher frequency pass-bands which are centered about overtones of the fundamental frequency. At least one of the electromechanical filters has a fundamental frequency that is different from the other filters and all the filters have a common overtone frequency. The band-pass filter will pass all frequencies falling within the band about the common overtone frequency, while all other frequencies will be suppressed.