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:
Oct. 19, 1976
Filed:
Feb. 13, 1976
Clinton J Hurd, Los Gatos, CA (US);
William J Kadzewick, San Jose, CA (US);
Xebec Systems, Inc., Sunnyvale, CA (US);
Abstract
A writing instrument comprising a housing including a flexible diaphragm and a sidewall forming a cavity therewithin, the diaphragm serving to distort in response to a movement of the sidewall, a plurality of strain gages attached to selected locations on the diaphragm, each strain gage having an electrical resistance and being responsive to distortion of the diaphragm and operative to produce a change in its electrical resistance corresponding to the distortion at its respective location, a reservoir capable of holding writing fluid and formed to be carried within the cavity, the reservoir including external ribs for frictionally engaging the sidewall and having a shaft extending therefrom, the shaft having a distal end for writing on a surface and a passageway for supplying writing fluid to the distal end, the distal end being movable in response to contact with the surface, whereby when the shaft is moved, such movement is transmitted through the reservoir and the sidewall to the diaphragm causing it to distort, and whereby such distortion causes the electrical resistance of the strain gages to change, and a bridge circuit responsive to the change in electrical resistance of the plurality of strain gages and operative to produce a signal representative of the movement of the distal end.