Robert Allan Berger

US Patent:

D2895498, Apr 28, 1987

Filed:

Nov 2, 1984

Appl. No.:

6/667630

Inventors:

Robert P. Berger - Encino CA

US Classification:

D24 10

US Patent:

49973827, Mar 5, 1991

Filed:

Jan 12, 1987

Appl. No.:

7/008064

Inventors:

Robert P. Berger - Encino CA

International Classification:

A61C 300

US Classification:

433163

Abstract:

Handle is formed with the metal portion of a dental prosthesis so that the handle can be used for supporting and handling the metal structure from the mold to the final finishing, when the handle is cut off. The handle preferably has both a ring for supporting the structure on a post and a ball for grasping of the metal structure.

US Patent:

46762949, Jun 30, 1987

Filed:

Sep 9, 1985

Appl. No.:

6/766391

Inventors:

Robert P. Berger - Encino CA

International Classification:

B22C 904

US Classification:

164 35

Abstract:

Gate is a wax structure for forming part of a wax master in investment casting of a dental prosthesis. The gate has a square feeder with a circular disc on each end. The square feeder reduces the cracking stresses between adjacent feeders to reduce unwanted fins, and the square shape aids in final cutoff of the cast prosthetic. In the wax master, one of the discs is secured to the prosthetic form and the other disc to the conventional reservoir bar. The disc shape aids in filleting to the form and bar.

US Patent:

45739218, Mar 4, 1986

Filed:

Jun 27, 1984

Appl. No.:

6/625112

Inventors:

Robert P. Berger - Encino CA

International Classification:

B29C 3352
B29C 4140

US Classification:

433167

Abstract:

The wax master sprue and runner or gate form used in the investment casting process of dental prostheses has a web between the runners or gates so that the runners or gates are secured together to prevent shifting of the runners or gates during the molding of the casting material around the wax master.

US Patent:

53378040, Aug 16, 1994

Filed:

May 6, 1993

Appl. No.:

8/059047

Inventors:

Robert P. Berger - Encino CA
Steven Benson - Simi Valley CA

Assignee:

Belle De St. Claire - Chatsworth CA

International Classification:

B22C 904
B22D 1306
B22D 1310

US Classification:

164287

Abstract:

An adjustable investment mold positioner includes a resilient band bent into a partial cylinder. Opposite ends of the band bound an opening at the side of the cylinder. A mold receiving member made of bent metal has side walls with bent connectors that are attached to the opposite ends of the band. A recess is formed between the side walls for receiving an oval investment mold. The outer cylindrical configuration of the positioner is readily engageable within the cradle of a conventional casting machine which is designed for normally receiving cylindrical investment molds. In this way, oval investment molds can be received in a secure manner within the conventional casting machines.

US Patent:

D3729800, Aug 20, 1996

Filed:

Aug 1, 1995

Appl. No.:

D/042119

Inventors:

Robert P. Berger - Encino CA

Assignee:

belle de st. claire - Chatsworth CA

US Classification:

D24176

US Patent:

44239459, Jan 3, 1984

Filed:

May 26, 1982

Appl. No.:

6/382130

Inventors:

Seaton T. Preston - Winnetka IL
Frank L. Greenwald - Western Springs IL
William D. Eich - Arlington Heights IL
Robert Berger - Chicago IL

Assignee:

G and G Products, Inc. - Niles IL

International Classification:

G03B 304

US Classification:

354313

Abstract:

An apparatus for use in developing film is disclosed. The apparatus is designed to hold the film during development in a processing solution. The apparatus fits and substantially closes the processing solution cannister to provide a substantially lightless processing environment. The apparatus further moves the film during development to agitate the processing solution.

US Patent:

56885334, Nov 18, 1997

Filed:

Feb 12, 1996

Appl. No.:

8/601074

Inventors:

Robert P. Berger - Encino CA

Assignee:

Belle de St. Claire, Inc. - Orange CA

International Classification:

B28B 734

US Classification:

425123

Abstract:

A mold assembly and sprue configuration for dental investment casting includes a ring shaped casing, a base and a cover all made of resilient plastic material and fictionally engaged with each other. The base includes a raised neck having a top surface with a sighting bead for use in mounting wax forms on the sprue, positioned within the casing. The sprue includes a post for engaging a blind bore in a hub of the base. The cover includes a downwardly extending plug which extends into the body of the casing, and a curved lip with recess for facilitating the pouring of investment solution into the mold. The sprue has three spokes and a ring which are all triangular in cross-section to reduce the amount of metal needed in the precision casting to be made with the invention and also to provide a convenient flat upper surface for mounting wax forms to the sprue.