公开(公告)号：US3615047A

公开(公告)日：1971-10-26

申请号：US3615047D

申请日：1969-06-30

Applicant: BELL TELEPHONE LABOR INC

Inventor： FELDMAN DAVID ,  SIBILIA JOHN T

IPC: B28D5/00 ,  H01L21/00 ,  H01L21/302 ,  H01L49/02 ,  B26F3/00

CPC classification number: H01L21/67092 ,  B28D5/0047 ,  H01L21/302 ,  H01L49/02 ,  Y10T225/10 ,  Y10T225/12 ,  Y10T225/30 ,  Y10T225/325

Abstract: APPARATUS FOR SEPARATING A SCRIBED PLATE OF BRITTLE MATERIAL UTILIZES TWO FLEXIBLE MEMBRANES BETWEEN WHICH THE PLATE IS VACUUM CLAMPED. A UNIFORM FORCE SUCH AS FLUID PRESSURE FORCES THE MEMBRANES INTO A DIE WHICH CAUSES THE MEMBRANES TO TRANSMIT UNIAXIAL STRESSES TO THE PLATE TO SEPARATE IT ALONG SCRIBE LINES. SEPARATION ALONG A SET OF SCRIBE LINES ORTHOGONAL TO THE FIRST SET IS ACHIEVED BY USING A DIE WHICH IS ORTHOGONAL TO THE FIRST DIE.

公开(公告)号：US3518571A

公开(公告)日：1970-06-30

申请号：US3518571D

申请日：1968-07-08

Applicant: BELL TELEPHONE LABOR INC

Inventor： FELDMAN DAVID ,  RAO TADIKONDA N

IPC: H03B1/00 ,  H03B5/24 ,  H03B5/26 ,  H04M1/50

CPC classification number: H03B5/26 ,  H03B5/24 ,  H03B2201/0283 ,  H04M1/50

公开(公告)号：US3602800A

公开(公告)日：1971-08-31

申请号：US3602800D

申请日：1969-05-21

Applicant: BELL TELEPHONE LABOR INC

Inventor： FELDMAN DAVID ,  GOLEMBESKI JOHN J ,  RAO TADIKONDA N ,  WYNDRUM RALPH W JR

IPC: H04M3/00 ,  G05F1/00 ,  G05F1/60

CPC classification number: H04M3/005

Abstract: A coupler for attaching customer-owned equipment to the telephone network permits any customer signal below a prescribed signal level to pass without distortion or attenuation but linearly attenuates signals exceeding the prescribed level. The coupler measures the mean power of the customer''s signal and utilizes the results to switch the proper attenuating load across the line. The switch circuit of the coupler has a hysteresis characteristic to prevent distortion of the customer''s signal by repeated switching between different alternating modes when the customer''s signal has slight variations about the prescribed threshold level.

公开(公告)号：US3460026A

公开(公告)日：1969-08-05

申请号：US3460026D

申请日：1967-05-08

Applicant: BELL TELEPHONE LABOR INC

Inventor： DOW ROBERT J ,  FELDMAN DAVID ,  LEE SAMUEL C ,  MITCHELL EDWARD S JR ,  WYNDRUM RALPH W JR

IPC: H01C1/12 ,  H01C1/16 ,  H01L49/02 ,  H01C7/00

CPC classification number: H01C1/16 ,  H01C1/12 ,  H01L49/02