US3785827A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic material stabilised against ultraviolet radiation
Assignee: Ilford Imaging Switzerland GmbH
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Filing: 1971-03-10
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Granted: 1974-01-15
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Expires: 1991-03-10
Abstract
Abstract This invention relates to colour photographic material. Said material is stabilized by means of a 2-hydroxybenzophenone which is free from sulphonic acid groups and which corresponds to the formula WHEREIN X represents a hydrogen or halogen atom, a possibly substituted alkyl, alkenyl or phenyl group, an alkylcarbonyl or alkylsulfonyl group or an A''-O group, Y represents a hydrogen or halogen atom, a possibly substituted alkyl group or an A''''-O group, A, A'' and A'''' each representing a hydrogen atom, a possibly substituted alkyl, alkenyl, cycloalkyl, aralkyl or phenyl group or a residue of the formula
Inventors
- 👤 M Duennenberger
- 👤 H Biland
- 👤 B Piller
- 👤 M Meier
- 👤 C Luethi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:49
CPC Classifications
G; G03; G03C; G03C11/00; G03C11/08; G03C11/10; C; C07; C07C; C07C205/00; C07C205/27; C07C205/35; C07C205/36; C07C205/38; C07C205/45; C07C49/00; C07C49/76; C07C49/82; C07C49/83; C07C49/84; C07C59/00; C07C59/40; C07C59/76; C07C59/90; G03C1/00; G03C1/76; G03C1/815; G03C1/8155
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
9 words
Material according to claim 1, wherein the 2-hydroxy-benzophenone is
Claim 2
Dependent Claim
9 words
Material according to claim 1, wherein the 2-hydroxy-benzophenone is
Claim 3
Dependent Claim
9 words
Material according to claim 1, wherein the 2-hydroxy-benzophenone is
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) | 1977-01-14 | 1977-07-16 | 1978-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-14 | 1981-07-16 | 1982-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-14 | 1985-07-16 | 1986-01-15 | $7700.00 | Window Closed / Lapsed |