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:
Jul. 21, 1987
Filed:
Aug. 26, 1986
Robert J Davidson, Boise, ID (US);
Hewlett Packard Company, Palo Alto, CA (US);
Abstract
Interferometer apparatus for determining the spatial relationship of two or more observed points such as the height of a magnetic transducer head as it moves over the surface of a spinning recording disc. A monochromatic light beam having components of characteristic polarization and frequency is separated with one component being directed upon the two observation points one of which may be on the transducer head and other may be on the spinning disc. The other component is simultaneously directed upon a reference surface. The reflected beams are then combined to produce an optical beat frequency which is subsequently detected electronically and converted to a voltage representative of the phase shift between images of the two points and utilized to provide the display of the distance between the two points.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile