US4092171A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Organophosphine chelates of platinum and palladium as sensitizers
Assignee: EIDP Inc
•
Filing: 1976-02-20
•
Granted: 1978-05-30
•
Expires: 1996-02-20
Abstract
Abstract Photographic colloid-silver halide emulsions have their sensitivity increased by the addition of at least one organo-phosphine chelate of a palladium or platinum metal salt.
Inventors
- 👤 John Howard Bigelow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:21
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/08; G03C1/09
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
47 words
A light-sensitive silver halide photographic element comprising a support coated with at least one silver halide emulsion containing as a chemical sensitizer a chelate of an organophosphine with a platinum or palladium salt, the latter being present in an amount sufficient to sensitize the silver halide emulsion.
Claim 2
Dependent Claim
47 words
A light-sensitive silver halide photographic element comprising a support coated with at least one silver halide emulsion containing as a chemical sensitizer a chelate of an organophosphine with a platinum or palladium salt, the latter being present in an amount sufficient to sensitize the silver halide emulsion.
Claim 3
Dependent Claim
15 words
The photographic element of claim 1 wherein the Pt or Pd salt is a halide.
Claim 4
Dependent Claim
15 words
The photographic element of claim 1 wherein the Pt or Pd salt is a chloride.
Claim 5
Dependent Claim
13 words
The photographic element of claim 1 wherein the chelate has the formula ##STR14##
Claim 6
Dependent Claim
24 words
The photographic element of claim 1 wherein the chelate has the formula [CH 3 P(OPh) 2 ] 2 PtCl 2 wherein Ph = phenyl.
Claim 7
Dependent Claim
24 words
The photographic element of claim 1 wherein the chelate has the formula (Ph 2 POCH 3 ) 2 PdCl 2 wherein Ph = phenyl.
Claim 8
Dependent Claim
24 words
The photographic element of claim 1 wherein the chelate has the formula [PhP(CH 3 ) 2 ] 2 PdCl 2 wherein Ph = phenyl.
Claim 9
Dependent Claim
13 words
The photographic element of claim 1 wherein the chelate has the formula ##STR15##
Claim 10
Dependent Claim
24 words
A photographic silver halide emulsion containing a sufficient amount of an organophosphine chelate of a Pt or Pd salt to chemically sensitize the emulsion.
Claim 11
Dependent Claim
24 words
A photographic silver halide emulsion containing a sufficient amount of an organophosphine chelate of a Pt or Pd salt to chemically sensitize the emulsion.
References Cited (Backward Citations)
US2540086A
Cited
SU195872A1
Cited
GB1295463A
Cited
US3804632A
Cited
US3930867A
Cited
US3904415A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-05-29 | 1981-11-28 | 1982-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-29 | 1985-11-28 | 1986-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-29 | 1989-11-28 | 1990-05-30 | $7700.00 | Window Closed / Lapsed |