US4108665A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilizers for photothermographic constructions
Assignee: 3M Co
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Filing: 1976-10-07
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Granted: 1978-08-22
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Expires: 1996-10-07
Abstract
Abstract Photothermographic materials may be stabilized by inclusion of compounds having terminal 1,1,1-tri bromoethoxy or 1,1,1-di bromochloroethoxy type groups.
Inventors
- 👤 Gustav Gutman
- 👤 Edward Goettert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:25
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/494; G03C1/498; G03C1/49836; G03C1/49845
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
88 words
A photothermographic imaging layer comprising a reducible silver source, photographic silver halide in catalytic proximity to said silver source, a reducing agent for silver ion, and a binder, said imaging layer being further characterized by the presence of a stabilizing amount of at least one compound selected from CRBr.sub.2 CR.sup.1 R.sup.2 R.sup.3 wherein R is Br or Cl, R 1 is independently H, alkyl, phenyl, or naphthyl, R 2 is independently H, alkyl or phenyl, and R 3 is OH, alkoxy, trihydrocarbylsiloxy, carbamate, sulfonate, carbonate, phosphate, or carboxylate.
Claim 2
Dependent Claim
88 words
A photothermographic imaging layer comprising a reducible silver source, photographic silver halide in catalytic proximity to said silver source, a reducing agent for silver ion, and a binder, said imaging layer being further characterized by the presence of a stabilizing amount of at least one compound selected from CRBr.sub.2 CR.sup.1 R.sup.2 R.sup.3 wherein R is Br or Cl, R 1 is independently H, alkyl, phenyl, or naphthyl, R 2 is independently H, alkyl or phenyl, and R 3 is OH, alkoxy, trihydrocarbylsiloxy, carbamate, sulfonate, carbonate, phosphate, or carboxylate.
Claim 3
Dependent Claim
30 words
The imaging layer of claim 1 wherein said at least one compound is selected from CBr.sub.3 CH.sub.2 R.sup.3 and ##STR5## wherein R 2 and R 3 are as defined above.
Claim 4
Dependent Claim
25 words
The imaging layer of claim 2 wherein said at least one compound is selected from CBr.sub.3 CH.sub.2 R.sup.3 wherein R 3 is as defined above.
Claim 5
Dependent Claim
14 words
The imaging layer of claim 3 wherein said at least one compound is 2,2,2-tribromoethanol.
Claim 6
Dependent Claim
27 words
The imaging layer of claim 1 wherein said at least one compound is present in an amount constituting 0.025 to 3% by weight of the imaging layer.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-08-21 | 1982-02-20 | 1982-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-08-21 | 1986-02-20 | 1986-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-08-21 | 1990-02-20 | 1990-08-22 | $7700.00 | Window Closed / Lapsed |