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. 27, 1976
Filed:
Sep. 03, 1974
Richard Robert Addiss, Jr, Bedford, MA (US);
Nedo Peter Albertinetti, Canton, MA (US);
Itek Corporation, Lexington, MA (US);
Abstract
Improved techniques for vacuum evaporating glass, using an electron beam to vaporize the glass, onto a polymeric substrate is disclosed. Suitable substrates include ophthalmic lenses formed from polymeric materials such as polymerized CR-39 resin. The improved technique necessitates the maintenance of certain critical coating conditions. These conditions are: (a) low background pressures; and, (b) an angle of glass vapor impringement below about 40.degree., measured from the normal; and, (c) an elevated substrate temperature. Additionally, the source glass has a relatively low water content and a relatively low thermal coefficient of expansion.