Patent US3726676A successfully refreshed from Google Patents.
US3726676A
Expired / Lapsed
US
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Process for forming a continuous tone negative and positive image
Assignee: WR Grace and Co Conn
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Filing: 1971-07-15
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Granted: 1973-04-10
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Expires: 1991-07-15
Abstract
Abstract HIS INVETION IS DIRECTED TOWARD FORMING A SILVERLESS CONTINUOUS TONE PHOTOGRAPHIC IMAGE HAVING A SCALE INDEX BETWEEN 0.5 AND 1.5 AND A GAMMA OF 0.5-1.5 (SEE "KODAK NOTES ON PRACTICAL DENSITOMETRY," PAMPHLET NO. E59, PAGES 1-76, EASTMAN KODAK COMPANY, ROCHESTER, N.Y., FOR DEFINITIONS) FROM A SUPPORTED PIGMENT OR DYE FILLED LIQUID PHOTOSENSITIVE COMPOSITION BY SELECTIVELY INSOLUBILIZING PORTIONS OF THE COMPOSITION ON EXPOSURE TO ACTINIC RADIATION AND REMOVING THE UNEXPOSED LIQUID PORTION OF HE COMPOSITION FROM THE SUPPORT.
Inventors
- 👤 A Ketley
- 👤 C Kehr
- 👤 J Touchette
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 02:23
CPC Classifications
G; G03; G03F; G03F1/00; G03F1/54; G03F1/56; G03F7/00; G03F7/004; G03F7/027; G03F7/0275
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) | 1976-04-09 | 1976-10-09 | 1977-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-09 | 1980-10-09 | 1981-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-09 | 1984-10-09 | 1985-04-10 | $7700.00 | Window Closed / Lapsed |