Patent US3623866A successfully refreshed from Google Patents.
US3623866A
Expired / Lapsed
US
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Stabilization of photochromic copy
Assignee: AB Dick Co
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Filing: 1968-11-01
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Granted: 1971-11-30
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Expires: 1988-11-01
Abstract
Abstract THE STABILIZATION OF COPY PRODUCED BY EXPOSURE OF A PHOTOCHROMIC LAYER FORMED OF HETEROPOLY ACIDS OF MOLYBDENUM AND TUNGSTE AND A REDUCING AGENT WHEREIN THE LAYER AFTER EXPOSURE IS WET WITH AN AQUEOUS ALKALINE SOLUTION OF AN ALKALINE MATERIAL.
Inventors
- 👤 Alexander Averbach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:49
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/56; Y; Y10; Y10S; Y10S430/00; Y10S430/163
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-29 | 1975-05-31 | 1975-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-29 | 1979-05-31 | 1979-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-29 | 1983-05-31 | 1983-11-30 | $7700.00 | Window Closed / Lapsed |