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:
Jan. 25, 1994
Filed:
Apr. 10, 1991
Applicant:
Inventors:
Michael H Freeman, Denbigh, GB;
Colin M Perrott, Portola Valley, CA (US);
Assignee:
Pilkington Diffractive Lenses Limited, St. Helens, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B44C / ; B29C / ;
U.S. Cl.
CPC ...
156345 ; 156643 ; 156654 ; 156668 ; 21912169 ; 21912173 ; 21912175 ;
Abstract
A consumable laser mask for forming a visual lens, especially a contact lens, in which at least a portion of the light passing through the lens is focussed by diffractive means. The laser mask is shaped to provide the diffractive means in the finished lens, and is made from a polymeric material with a thickness such that no residue is left at the completion of the laser ablation process. The invention also includes a method of manufacturing a lens using a consumable laser mask in accordance with the present invention.