公开(公告)号：US3128351A

公开(公告)日：1964-04-07

申请号：US1244060

申请日：1960-03-02

Applicant: BELL TELEPHONE LABOR INC

Inventor： HOHMANN JR LAWRENCE A ,  KINSMAN FRANK W ,  NENNINGER THEODORE P

IPC: H04M1/276

CPC classification number: H04M1/276

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.

公开(公告)号：US3488451A

公开(公告)日：1970-01-06

申请号：US3488451D

申请日：1967-04-05

Applicant: BELL TELEPHONE LABOR INC

Inventor： NENNINGER THEODORE P ,  SCHENKER LEO

IPC: H04M1/50 ,  H04M1/26

CPC classification number: H04M1/50

公开(公告)号：US3286038A

公开(公告)日：1966-11-15

申请号：US29067563

申请日：1963-06-26

Applicant: BELL TELEPHONE LABOR INC

Inventor： FIELD JAMES M ,  NENNINGER THEODORE P ,  SCHOLES DAVID H

IPC: H04M9/00 ,  H04Q3/62

CPC classification number: H04M9/001 ,  H04Q3/625

公开(公告)号：US3153130A

公开(公告)日：1964-10-13

申请号：US11547361

申请日：1961-06-07

Applicant: BELL TELEPHONE LABOR INC

Inventor： NENNINGER THEODORE P

IPC: H01H13/50

CPC classification number: H01H13/506