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:
Dec. 19, 1978
Filed:
Mar. 15, 1978
Edward E Hatter, Mission Viejo, CA (US);
Richard H Taylor, Santa Ana, CA (US);
Other;
Abstract
A unique 'compass' device for drawing and measuring circles, and employing a template with a center pin and many holes. Indicia are provided on the template to indicate concentric and generally annular zones centered at a certain center, each such zone having its boundary relatively adjacent the center located a first distance from the center (on the particular distance scale employed on the compass), and also having its boundary relatively remote from the center located a second and higher distance from the center on such distance scale. The holes lie along an Archimedes spiral centered at the center, and all holes located a first perdetermined fraction of each whole number (of the particular distance scale) are disposed along one radial line extending from the center; all the holes located a second and next-higher predetermined fraction of each whole number of the particular distance scale are disposed along a second radial line, etc.