Patent · US Expired

Method of preparing a hologram

US4977047A · kind A · utility

1Cited by

3References

17Claims

0Family size

Assignee

Ilford AG

Inventors

Neil F. Ashford · Crewe, US
Alan Hodgson · Stockport, GB
Peter Blum · Kronberg, DE
Stephen Postle · Wilmslow, GB

Key dates

Filing date	Mar 1, 1989
Grant date	Dec 11, 1990
Priority date	—
Expiry date	Mar 1, 2009

Classification

Technology area (CPC G)Physics
CPC primaryG03H2260/16
WIPO fieldOptics
WIPO sectorInstruments

Abstract

A method of preparing a hologram which is of the silver halide in gelatin binder type which method comprises holographically exposing the holographic material by use of coherent light, developing the holographic image by a chemical process and wherein after development the material is treated with an aqueous solution of an anionic surfactant which comprises at least one alkyl group having at least four carbon atoms, to achieve bathochromic shift in the replay wavelength.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.