The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 25, 2004
Filed:
Oct. 06, 1999
Applicant:
Inventors:
R. Thomas Gibbons, II, Seattle, WA (US);
John M. Lutian, Bellevue, WA (US);
Kennard E. Nielsen, Redmond, WA (US);
Assignee:
Microsoft Corporation, Redmond, WA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03M 1/100 ; H03K 1/794 ;
U.S. Cl.
CPC ...
H03M 1/100 ; H03K 1/794 ;
Abstract
A keypad includes a light emitting source, a light detector and waveguide assembly adapted to receive light from the light emitting source and having a plurality of waveguide branches adapted to conduct light to the light detector. A plurality of user actuated keys is provided. Each key includes a moveable engaging member disposed proximate a waveguide branch to engage the waveguide branch as a function of key operation.