US3816130A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic production of phase holograms and developing with a nontanning developer
Assignee: Agfa Gevaert AG
•
Filing: 1972-04-26
•
Granted: 1974-06-11
•
Expires: 1992-04-26
Abstract
Abstract Photographic process for the production of phase holograms in silver halide emulsion layers. After exposure to light reflected from the hologram structure, the silver halide emulsion layer is developed with a nontanning developer, treated with a short stop bath, washed and then bleached in an oxidizing bleaching bath. The silver compound produced in the exposed areas of the layer by the bleaching process is dissolved out and the layer is then dried. Suitable non-tanning developers are, in particular, hydroquinone, 1-phenyl-pyrazolidone-3 or a compound or the paminophenol series.
Inventors
- 👤 J Eggers
- 👤 H Buschmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:40
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/32; G03C5/40; G03C5/44; G03H; G03H1/00; G03H1/04; G03H1/18
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
21 words
A process as claimed in claim 1 in which the desensitizer used in Pinakryptol yellow, Pinakryptol green or Wursters blue perchlorate.
Claim 2
Dependent Claim
14 words
A process as claimed in claim 1 in which the desensitizer used is phenosafranine.
Claim 3
Dependent Claim
26 words
A process as claimed in claim 1 in which the layer is treated after removal of the silver compounds with an alcoholic bath to promote drying.
Claim 4
Dependent Claim
30 words
A process as claimed in claim 1 in which the alcoholic bath contains a desensitizer selected from the group consisting of Pinakryptol yellow, Pinakryptol green, Wursters blue perchlorate and phenosafranine.
References Cited (Backward Citations)
US3642472A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |