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:
Nov. 28, 1989
Filed:
Apr. 21, 1988
Richard R Baldwin, Saratoga, CA (US);
Hewlett-Packard Company, Palo Alto, CA (US);
Abstract
A stylus contains a switch which makes contact in response to slight radial motion of the stylus tip relative to the stylus housing. Means for emitting radiation operates in response to switch closure, thereby emitting a beam of radiation out the tip. The stylus includes an internal power source, such as one or more batteries, for operation of the means for emitting radiation. When such internal power source is capable of being recharged, the stylus may include means for external connection to the recharging supply. In another embodiment, the stylus is capable of emitting more than one type of radiation which are distinguishable, such as by wavelength, modulation type, or other convenient means. In this manner, the stylus can be controlled by the user to emit different signals, which may be interpreted by a receiving device, for example, as different colors, or as a write signal versus an erase signal. In one embodiment, such an erase signal is emitted from the opposite end of the stylus as the write signal.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile