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:
Feb. 28, 1989
Filed:
Nov. 20, 1987
John E Wreede, Monrovia, CA (US);
Edward T Knobbe, Playa Del Rey, CA (US);
Hughes Aircraft Company, Los Angeles, CA (US);
Abstract
A method for treating photosensitive, hydrophilic gelatin holograms to reduce swelling when the gelatin is exposed to moisture. Two reactants which are capable of forming solid reaction products are migrated into the interstitial voids within the gelatin to form a filled gelatin which is resistant to both swelling and shrinkage due to moisture variations. Embodiments are disclosed in which the reactants are migrated simultaneously and sequentially into the gelatin. Examples of a first reactant are silane, chloronated silanes (trichlorosilane and tetrachlorosilane, fluorosilane) and a second reactant oxygen, ammonia, water vapor and suitable gaseous sources of oxygen.