Patent US3642484A successfully refreshed from Google Patents.
US3642484A
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Unsaturated photochromic indolino-spiropyran monomers and polymers prepared therefrom
Assignee: Agfa Gevaert NV
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Filing: 1969-09-11
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Granted: 1972-02-15
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Expires: 1989-09-11
Abstract
Abstract Photochromic unsaturated monomeric indolino-spiropyrans and the polymers and copolymers prepared therefrom are described. These photochromic materials in a light-sensitive photographic system containing a photohardening polymeric system provide nonfading photographic images.
Inventors
- 👤 Albert Lucien Poot
- 👤 Gerard Albert Delzenne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 03:35
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/038; C; C08; C08F; C08F20/00; C08F20/02; C08F20/10; C08F20/34; G03C; G03C1/00; G03C1/685; G03C1/72; G03C1/73; G03C1/733; G03F7/008; G03F7/012
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
11 words
Photochromic homopolymers of the unsaturated photochromic monomeric indolino-spiropyrans of claim 1.
Claim 2
Dependent Claim
19 words
Photochromic copolymers of the unsaturated photochromic monomeric indolino-spiropyrans of claim 1 with at least one other ethylenically unsaturated monomer.
Claim 3
Dependent Claim
36 words
Light-sensitive photographic material capable of forming nonfading images on exposure to actinic light, which comprises a light-sensitive layer or stratum comprising a photochromic monomer, homopolymer, or copolymer according to claim 1 and a photohardening polymeric system.
Claim 4
Dependent Claim
4 words
1'', 3'', 3''-trimethyl-6''-methacryloyloxy-6-nitro-spiro(2H, 1-benzopyran-2,2''-indoline).
Claim 5
Dependent Claim
2 words
1''-(2''''-methacryloyloxyethyl)-3'',3''-dimethyl-6-nitrospiro(2H, 1-benzopyran-2,2''-indoline).
Claim 6
Dependent Claim
9 words
The photochromic copolymer of 1'',3'',3''-trimethyl-6''-methacryloyloxy-6-nitrospiro(2H,1-benzopyran-2,2'' -indoline) and methyl methacrylate.
Claim 7
Dependent Claim
9 words
The photochromic copolymer of 1''-(2''''-methacryloyl-oxyethyl)-3'',3''-dimethyl-6-nitrospiro(2H,1-benzopyran -2,2''-indoline) and methyl methacrylate.
Claim 8
Dependent Claim
13 words
The photochromic copolymer of 1'' -(2''''-methacryloyl-oxyethyl)-3'',3''-dimethyl-6-nitrospiro(2H, 1-benzopyran-2,2''-indoline), methyl methacrylate, and 4-acrylamido-phenol-(p-axidobenzoic acid ester).
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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) | 1975-02-14 | 1975-08-16 | 1976-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-14 | 1979-08-16 | 1980-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-14 | 1983-08-16 | 1984-02-15 | $7700.00 | Window Closed / Lapsed |