Patent US4784939A successfully refreshed from Google Patents.
US4784939A
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US
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Photothermographic elements
Assignee: Carestream Health Inc
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Filing: 1987-09-02
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Granted: 1988-11-15
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Expires: 2007-09-02
Abstract
Abstract Radiation sensitive thermally developable imaging elements comprise: (a) photosensitive silver halide, (b) light insensitive silver salt oxidizing agent, (c) reducing agent for silver ions, and (d) a benzoyl acid class of antifoggant. The antifoggants are effective in both reducing spurious background image densities and in stabilizing the film against sensitometric changes during storage.
Inventors
- 👤 Oanh Van Pham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:05
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/494; G03C1/498; G03C1/49836; G03C1/49845
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
93 words
A photothermographic emulsion comprising photosensitive silver halide, silver oxidizing compound, reducing agent for silver ion, and a binder which contains a fog-suppressing effective amount of a compound having the formula ##STR4## wherein R 1 , R 2 , R 3 and R 4 are independently selected from the group consisting of hydrogen, halogen, cyano and nitro, with the proviso that at least one of R 1 , R 2 , R 3 and R 4 are other than hydrogen, and A is selected from the group consisting of arylene, alkylene, aralkylene and alkarylene.
Claim 2
Dependent Claim
93 words
A photothermographic emulsion comprising photosensitive silver halide, silver oxidizing compound, reducing agent for silver ion, and a binder which contains a fog-suppressing effective amount of a compound having the formula ##STR4## wherein R 1 , R 2 , R 3 and R 4 are independently selected from the group consisting of hydrogen, halogen, cyano and nitro, with the proviso that at least one of R 1 , R 2 , R 3 and R 4 are other than hydrogen, and A is selected from the group consisting of arylene, alkylene, aralkylene and alkarylene.
Claim 3
Dependent Claim
9 words
The emulsion of claim 1 wherein A is alkylene.
Claim 4
Dependent Claim
21 words
The emulsion of claim 1 wherein one of R 1 , R 2 , R 3 and R 4 is halogen.
Claim 5
Dependent Claim
21 words
The emulsion of claim 2 wherein one of R 1 , R 2 , R 3 and R 4 is halogen.
Claim 6
Dependent Claim
26 words
The emulsion of claim 1 wherein one of R 1 , R 2 , R 3 and R 4 is halogen and the remainder are hydrogen.
Claim 7
Dependent Claim
26 words
The emulsion of claim 2 wherein one of R 1 , R 2 , R 3 and R 4 is halogen and the remainder are hydrogen.
Claim 8
Dependent Claim
9 words
The emulsion of claim 1 wherein A is phenylene.
Claim 9
Dependent Claim
21 words
The emulsion of claim 7 wherein one of R 1 , R 2 , R 3 and R 4 is halogen.
Claim 10
Dependent Claim
26 words
The emulsion of claim 7 wherein one of R 1 , R 2 , R 3 and R 4 is halogen and the remainder are hydrogen.
Claim 11
Dependent Claim
21 words
The emulsion of claim 1 further comprising an antifoggant selected from the group consisting of molecular halogen, N-haloimides, and mercuric salts.
Claim 12
Dependent Claim
21 words
The emulsion of claim 2 further comprising an antifoggant selected from the group consisting of molecular halogen, N-haloimides, and mercuric salts.
Claim 13
Dependent Claim
21 words
The emulsion of claim 3 further comprising an antifoggant selected from the group consisting of molecular halogen, N-haloimides, and mercuric salts.
Claim 14
Dependent Claim
21 words
The emulsion of claim 7 further comprising an antifoggant selected from the group consisting of molecular halogen, N-haloimides, and mercuric salts.
Claim 15
Dependent Claim
21 words
The emulsion of claim 8 further comprising an antifoggant selected from the group consisting of molecular halogen, N-haloimides, and mercuric salts.
Claim 16
Dependent Claim
21 words
The emulsion of claim 9 further comprising an antifoggant selected from the group consisting of molecular halogen, N-haloimides, and mercuric salts.
Claim 17
Dependent Claim
31 words
The emulsion of claim 1 further comprising an antifoggant selected from the group consisting of molecular halogen and N-haloimide present in an amount of from 0.0001 to 0.1 moles/mole of silver.
Claim 18
Dependent Claim
31 words
The emulsion of claim 2 further comprising an antifoggant selected from the group consisting of molecular halogen and N-haloimide present in an amount of from 0.0001 to 0.1 moles/mole of silver.
Claim 19
Dependent Claim
31 words
The emulsion of claim 7 further comprising an antifoggant selected from the group consisting of molecular halogen and N-haloimide present in an amount of from 0.0001 to 0.1 moles/mole of silver.
Claim 20
Dependent Claim
31 words
The emulsion of claim 8 further comprising an antifoggant selected from the group consisting of molecular halogen and N-haloimide present in an amount of from 0.0001 to 0.1 moles/mole of silver.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-11-15 | 1992-05-16 | 1992-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-15 | 1996-05-16 | 1996-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-15 | 2000-05-16 | 2000-11-15 | $7700.00 | Window Closed / Lapsed |