Patents Assigned to TDA, Inc.

Personal computer keyboard template for displaying operating instructions for software program

Patent number: D291697

Type: Grant

Filed: December 14, 1984

Date of Patent: September 1, 1987

Assignee: TDA, Inc.

Inventor: Thorvald E. Duffin, II
Personal computer keyboard template for displaying operating instructions for software program

Patent number: D291699

Type: Grant

Filed: July 9, 1985

Date of Patent: September 1, 1987

Assignee: TDA, Inc.

Inventor: Thorvald E. Duffin, II
Personal computer keyboard template for displaying operating instructions for software program

Patent number: D291992

Type: Grant

Filed: May 31, 1985

Date of Patent: September 22, 1987

Assignee: TDA, Inc.

Inventor: Thorvald E. Duffin, II
Personal computer keyboard template for displaying operating instructions for software program

Patent number: D291993

Type: Grant

Filed: May 31, 1985

Date of Patent: September 22, 1987

Assignee: TDA, Inc.

Inventor: Thorvald E. Duffin, II
Personal computer keyboard template for displaying operating instructions for software program

Patent number: D291994

Type: Grant

Filed: May 31, 1985

Date of Patent: September 22, 1987

Assignee: TDA, Inc.

Inventor: Thorvald E. Duffin, II
Personal computer keyboard template for displaying operating instructions for software program

Patent number: D291995

Type: Grant

Filed: May 31, 1985

Date of Patent: September 22, 1987

Assignee: TDA, Inc.

Inventor: Thorvald E. Duffin, II
Personal computer keyboard template for displaying operating instructions for software program

Patent number: D291996

Type: Grant

Filed: May 31, 1985

Date of Patent: September 22, 1987

Assignee: TDA, Inc.

Inventor: Thorvald E. Duffin, II
Personal computer keyboard template for displaying operating instructions for software program

Patent number: D291997

Type: Grant

Filed: May 31, 1985

Date of Patent: September 22, 1987

Assignee: TDA, Inc.

Inventor: Thorvald E. Duffin, II
Personal computer keyboard template for displaying operating instructions for software program

Patent number: D291998

Type: Grant

Filed: May 31, 1985

Date of Patent: September 22, 1987

Assignee: TDA, Inc.

Inventor: Thorvald E. Duffin, II