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:
Jun. 23, 1981
Filed:
Nov. 14, 1979
Brian F Moss, Rayleigh, GB;
Ciba-Geigy AG, Basel, CH;
Abstract
A photographic masking frame is described in which there is a base plate and a raisable frame which holds the print material flat on the base when in the working position and which has an opening in it which is closable by a removable square mask formed in two portions. One of these portions is L-shaped and covers substantially three quarters of the area of the opening and the other of these portions is square and covers the remaining quarter of the opening. The removable mask as a whole can be lifted as a single unit and fits into a square recess of approximately the same dimensions which is made in the top surface of the raisable frame. The area of the recess is greater than the area of the aperture in the frame. The square portion of the mask is raisable without disturbing the L-shaped portion of the mask and overlaps the adjacent edges of the L-shaped portion of the mask and so renders the join light-tight.