公开(公告)号：US2856809A

公开(公告)日：1958-10-21

申请号：US45339054

申请日：1954-08-31

Applicant: SERVO CORP OF AMERICA

Inventor： HENRY BLACKSTONE

IPC: G02B27/22

CPC classification number: G02B27/2235

公开(公告)号：US2848671A

公开(公告)日：1958-08-19

申请号：US48199655

申请日：1955-01-17

Applicant: SERVO CORP OF AMERICA

Inventor： MCDONALD JOSEPH F

IPC: H02P5/50

CPC classification number: H02P5/50

公开(公告)号：US2844714A

公开(公告)日：1958-07-22

申请号：US55667455

申请日：1955-12-30

Applicant: SERVO CORP OF AMERICA

Inventor： JULES CARDON ,  RICHTER FREDERICK G

IPC: H03G3/26

CPC classification number: H03G3/26

公开(公告)号：US2798962A

公开(公告)日：1957-07-09

申请号：US60864556

申请日：1956-07-18

Applicant: SERVO CORP OF AMERICA

Inventor： WORMSER ERIC M

IPC: G01J5/08

CPC classification number: G01J5/08 ,  G01J5/0806 ,  G01J5/0834 ,  G01J5/0859 ,  Y10S246/01

公开(公告)号：US2749442A

公开(公告)日：1956-06-05

申请号：US28392252

申请日：1952-04-23

Applicant: SERVO CORP OF AMERICA

Inventor： HANSEL PAUL G

IPC: H03L7/12 ,  H03L7/20

CPC classification number: H03L7/12 ,  H03L7/20

公开(公告)号：US2581158A

公开(公告)日：1952-01-01

申请号：US9145049

申请日：1949-05-05

Applicant: SERVO CORP OF AMERICA

Inventor： GORDON WILLEY FRANK

IPC: H02P7/292

CPC classification number: H02P7/293 ,  Y10T307/872

公开(公告)号：US3562598A

公开(公告)日：1971-02-09

申请号：US3562598D

申请日：1968-06-20

Applicant: SERVO CORP OF AMERICA

Inventor： DODD ARTHUR E

IPC: H03K17/292 ,  H01H47/18

CPC classification number: H03K17/292

Abstract: A solid-state circuit is described for controlling a railroad signal delay device wherein the time element is formed by a capacitor and a resistor. A polarized relay is employed in a discharge circuit formed by the capacitor, a semiconductor switch and the coil of the relay. Expiration of the time element operates to close the switch in the discharge circuit. The coil of the relay is so oriented in the circuit that during capacitor charging, the magnetic bias is effectively increased, whereas during the discharge initiated by the closing of the semiconductor switch, the bias is overcome.

公开(公告)号：US3460147A

公开(公告)日：1969-08-05

申请号：US3460147D

申请日：1967-12-11

Applicant: SERVO CORP OF AMERICA

Inventor： RICHTER FREDERICK G ,  GUERRIERE THOMAS V ,  WILLIAMS CHRISTIAN B

IPC: G01S3/54 ,  G01S5/02

CPC classification number: G01S3/54

公开(公告)号：US3408493A

公开(公告)日：1968-10-29

申请号：US60142066

申请日：1966-12-13

Applicant: SERVO CORP OF AMERICA

Inventor： WESTOVER THOMAS A ,  MARK WEINSTEIN

IPC: B61L1/16

CPC classification number: B61L1/165

公开(公告)号：US3396271A

公开(公告)日：1968-08-06

申请号：US62325367

申请日：1967-03-15

Applicant: SERVO CORP OF AMERICA

Inventor： GALLAGHER CORNELIUS A

IPC: B61L1/10 ,  B61L1/16 ,  B61L13/04

CPC classification number: B61L1/165 ,  B61L1/10 ,  B61L13/047