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. 08, 1980
Filed:
Mar. 23, 1978
Willis T Watkins, Kansas City, MO (US);
Parmelee Industries, Incorporated, Kansas City, MO (US);
Abstract
A plastic frame safety spectacle of the type provided with removeable concavo-convex lenses has a variable-depth lens channel formed in the respective plastic rims, each channel being configured to complementally receive a lens periphery whereby the lenses are securely held in position within the rims yet may be removed or replaced using only manual pressure and without requiring heating or other special processing of the frame. Each lens channel is continuous around its respective rim, gradually and progressively becoming deeper as the upper portion of the rim is approached such that maximum restraining is provided for the lenses along the top rims where deformation is most likely to occur from twisting or bending of the spectacle frame. The back portion of each rim is provided with a lens-engaging support ledge to preclude removal of the lenses from the backside of the frame thereby seating the lenses against dislodging by frontal impact.