公开(公告)号：US2703037A

公开(公告)日：1955-03-01

申请号：US28795852

申请日：1952-05-15

Applicant: GEN SCIENTIFIC CORP

Inventor： HERMAN LOWENTHAL

IPC: G02B13/02

CPC classification number: G02B13/02

公开(公告)号：US2645157A

公开(公告)日：1953-07-14

申请号：US28795952

申请日：1952-05-15

Applicant: GEN SCIENTIFIC CORP

Inventor： HERMAN LOWENTHAL

IPC: G02B13/00

CPC classification number: G02B13/00

公开(公告)号：US2287468A

公开(公告)日：1942-06-23

申请号：US33143640

申请日：1940-04-24

Applicant: GEN SCIENTIFIC CORP

Inventor： IRVING CISSKI

IPC: G02B7/02

CPC classification number: G02B7/02

公开(公告)号：US3263562A

公开(公告)日：1966-08-02

申请号：US25672763

申请日：1963-02-06

Applicant: GEN SCIENTIFIC CORP

Inventor： HERMAN LOWENTHAL

IPC: G02B13/00

CPC classification number: G02B13/00

公开(公告)号：US2844072A

公开(公告)日：1958-07-22

申请号：US61459256

申请日：1956-10-08

Applicant: GEN SCIENTIFIC CORP

Inventor： HERMAN LOWENTHAL

IPC: G02B9/34

CPC classification number: G02B9/34

公开(公告)号：US2601805A

公开(公告)日：1952-07-01

申请号：US20835951

申请日：1951-01-29

Applicant: GEN SCIENTIFIC CORP

Inventor： HERMAN LOWENTHAL

IPC: G02B9/34

CPC classification number: G02B9/34

公开(公告)号：US2346291A

公开(公告)日：1944-04-11

申请号：US35973440

申请日：1940-10-04

Applicant: GEN SCIENTIFIC CORP

Inventor： IRVING CISSKI

IPC: G02B7/04

CPC classification number: G02B7/04 ,  Y10S359/90 ,  Y10T29/4984 ,  Y10T29/49963

公开(公告)号：US2192551A

公开(公告)日：1940-03-05

申请号：US19959638

申请日：1938-04-02

Applicant: GEN SCIENTIFIC CORP

Inventor： FRANK KASPAR

IPC: H01J17/06

CPC classification number: H01J17/066 ,  H01J2893/0066

公开(公告)号：US3584936A

公开(公告)日：1971-06-15

申请号：US3584936D

申请日：1969-11-03

Applicant: GEN SCIENTIFIC CORP

Inventor： LOWENTHAL HERMAN

IPC: G02B13/24 ,  G02B9/16

CPC classification number: G02B13/24

Abstract: A symmetrical triplet lens system for photocopying apparatus characterized by the use of low cost materials and low cost steps in manufacturing. The two outside lens elements have a like index of refraction falling in the range from 1.59 to 1.63, and the inside lens element has an index of refraction falling in the range from 1.58 to 1.62. The lens system is designed primarily for 1 to 1 magnification, and is substantially free of coma, distortion and chromatic difference of magnification. The system also is well corrected for spherical aberration. The construction of the disclosed lens system readily is apparent from the tables hereinafter.

公开(公告)号：US3268044A

公开(公告)日：1966-08-23

申请号：US35923564

申请日：1964-04-13

Applicant: GEN SCIENTIFIC CORP

Inventor： LIPPMAN MYRON E

IPC: F16D27/112

CPC classification number: F16D27/112 ,  F16D2027/008