PRINTED CIRCUIT KEYBOARD

• US 3,503,031 A
• Filed: 02/11/1969
• Issued: 03/24/1970
• Est. Priority Date: 02/11/1969
• Status: Expired due to Term

• Current Assignee: Keith A. Nyhus, Richard M. Sedro
• Original Assignee: Keith A. Nyhus, Richard M. Sedro
• Inventors: Nyhus, Keith A., Sedro, Richard M.
• Application Number:
  US04/798,424
• Time in Patent Office: 406 Days
• US Class Current: 338/99
• CPC Class Codes: G06C 7/02 Keyboards
• CPC Class Codes: H01C 10/106 on resistive material dispersed in an elastic material H01C10/103 and H01C10/12 take precedence; for electric switches H01H1/029
• CPC Class Codes: H01C 10/12 by changing surface pressure between resistive masses or resistive and conductive masses, e.g. pile type
• CPC Class Codes: H01H 1/029 comprising conducting material dispersed in an elastic support or binding material
• CPC Class Codes: H03K 17/967 having a plurality of control members, e.g. keyboard H03K17/969, H03K17/972, H03K17/98 take precedence
• CPC Class Codes: Y10T 29/49082 Resistor making
• CPC Class Codes: Y10T 29/49099 Coating resistive material on a base

Claims