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:
Sep. 04, 1984
Filed:
Aug. 09, 1982
David L Rawlings, Bayville, NY (US);
Other;
Abstract
Plastic contact lenses are formed in a casting process in which the required amount of lens-forming material is charged into a mold half, the mating lens half is inserted but only far enough to contact at least the surface of the lens-forming material. Next the inserted part is allowed to dwell or is slowly withdrawn for a sufficient distance to cause the liquid lens-forming material to move to the center of the two molding surfaces and to approximate a column between the two molding surfaces. The moveable mold portion is then quickly inserted into the mold pushing the lens-forming material uniformly outwardly and displacing any air between the two molding surfaces to form a contact lens devoid of air bubbles and entrained air.