Arthur W Mueller

US Patent:

39588734, May 25, 1976

Filed:

Jun 9, 1975

Appl. No.:

5/585009

Inventors:

Arthur C. Mueller - Niles IL

Assignee:

Bell & Howell Company - Chicago IL

International Classification:

G03B 156

US Classification:

352157

Abstract:

A sprocket assembly for a motion picture projector and a method of threading and removing film from the sprocket assembly is disclosed. By selected configuration of the sprocket and the stationary sprocket guard, including aligner and keeper portions cooperating with the teeth of the sprocket, the film is inserted and removed by simply bending and lowering or twisting and lifting relative to the sprocket assembly.

US Patent:

39633330, Jun 15, 1976

Filed:

Feb 25, 1974

Appl. No.:

5/445469

Inventors:

Arthur C. Mueller - Niles IL
Erwin E. Figge - Des Plaines IL

Assignee:

Polaroid Corporation - Cambridge MA

International Classification:

G03B 2302

US Classification:

352 72

Abstract:

A control system for a cassette-load movie camera having an automatic exposure control system. A variable neutral density filter adjusts the exposure control system to the film sensitivity, and a sensitivity range control adjusts the exposure control system alternatively for a range of high film sensitivities or a range of low film sensitivities. Cassette indicia automatically effect a filter setting and sensitivity range setting upon placement of the cassette within the camera. A switching system controls energization of the exposure control system in relation to energization of the camera drive motor.