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:
Apr. 11, 1978
Filed:
Dec. 23, 1976
Christopher P Thissen, Austin, MN (US);
Geo. A. Hormel & Co., Austin, MN (US);
Abstract
A method and apparatus for making biological discs comprises the steps and means for welding the longitudinal edges of a pair of identical rectangular plastic sheets together to form a single large sheet. This single large sheet is conveyed to a heating and vacuum forming station where the sheet is heated and vacuum formed to have a plurality of convex cup-like projections formed in the surface thereof. The sheet is then moved to a cutting station where heating mechanisms form openings therein for accommodating an axle and a plurality of tie rods, and the sheet is cut in circular configuration by a cutting device shiftable on a radius of predetermined magnitude.