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:
Dec. 27, 1983
Filed:
Apr. 16, 1982
Barbara D Grant, San Jose, CA (US);
Magdalena M Hilden, Felton, CA (US);
Carol R Jones, San Jose, CA (US);
Glenn T Sincerbox, San Jose, CA (US);
International Business Machines, Armonk, NY (US);
Abstract
A method for making high diffraction efficiency holograms from dichromated gelatin (DCG) including the steps of curing the DCG for a specified time under controlled temperature and humidity conditions, periodically removing the DCG material from the curing conditions, placing a dye spot on the cured DCG material, measuring the extent of diffusion of the dye spot after a predetermined time, replacing the DCG material into the curing conditions, repeating the method until dye spot diffusion of a predetermined size occurs, and using the DCG material at that cure state to make holograms.