-
公开(公告)号：US3128349A
公开(公告)日：1964-04-07
申请号：US5091660
申请日：1960-08-22
Applicant: BELL TELEPHONE LABOR INC
Inventor： BOESCH FRANCIS T , NASH DONALD H , LEO SCHENKER
IPC: H04Q1/453
CPC classification number: H04Q1/453
-
公开(公告)号：US3676607A
公开(公告)日：1972-07-11
申请号：US3676607D
申请日：1969-11-25
Applicant: BELL TELEPHONE LABOR INC
Inventor： NASH DONALD H , NENNINGER THEODORE P , PRESCOTT ROBERT E
IPC: H01H13/702 , H01H13/703 , H01H13/785 , H04M1/23 , H04M1/50
CPC classification number: H01H13/785 , H01H13/702 , H01H13/703 , H01H2201/024 , H01H2201/032 , H01H2203/02 , H01H2203/05 , H01H2211/028 , H01H2217/01 , H01H2223/034 , H01H2229/026 , H01H2229/034 , H01H2229/036 , H01H2231/022 , H01H2239/006 , H01H2239/026 , H04M1/23
Abstract: This disclosure describes a telephone station dial having a compliant membrane supporting an array of pushbuttons. A conductive region on the membrane beneath each button contacts, on depression, printed circuit paths associated with two trigger circuits that in turn connect to a specific pair of multifrequency oscillator inputs. The trigger circuits comprise field effect transistors which provide a specified, unvarying output signal in response to the impedance change, either resistive or capacitive.
-
3.发明授权Gyrator circuit utilizing a plurality of cascaded pairs of insulated-gate,field effect transistors 失效使用绝缘栅，场效应晶体管的多个对称的陀螺仪电路
公开(公告)号：US3518584A
公开(公告)日：1970-06-30
申请号：US3518584D
申请日：1968-07-25
Applicant: BELL TELEPHONE LABOR INC
Inventor： MILLER JOHN A , NASH DONALD H
CPC classification number: H03H11/42
-
4.发明授权Frequency divider for video systems empolying blocking oscillator utilizing reverse breakdown diode in feedback circuit 失效用于视频系统的分频器，用于在反馈电路中使用反向击穿二极管阻塞振荡器
公开(公告)号：US3144581A
公开(公告)日：1964-08-11
申请号：US10887661
申请日：1961-05-09
Applicant: BELL TELEPHONE LABOR INC
Inventor： JOEL GREENBURG , MEACHAM LARNED A , NASH DONALD H , LEO SCHENKER
-
-
-
Search Results
4
records
(took 0.014 seconds)
