US3897255A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photoimaging compositions comprising complex of prophyrin-SO{HD 2 {B as sensitizer
Assignee: Monsanto Co
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Filing: 1973-10-10
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Granted: 1975-07-29
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Expires: 1993-10-10
Abstract
Abstract This invention concerns a photoimaging procedure in which the image is characterized by a differential concentration of sulfate groups, depending upon the degree of light exposure, and is developable by selective absorption of dyes and other procedures. The sulfate groups can be obtained by SO2 treatment of hydroperoxy groups produced in a photooxidation imaging procedure.
Inventors
- 👤 Floyd B Erickson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:52
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/72; G03C1/73; G03C1/733; Y; Y10; Y10S; Y10S430/00; Y10S430/1053; Y10S430/1055; Y10S430/114; Y10S430/116; Y10S430/127
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
23 words
A COMPOSITION COMPRISING A PHOTOCHEMICALLY OXIDIZABLE POLYMR CONTAINING ALPHATIC CARBON-CARBON UNSATURATION AND AN ADDUT OR COMPLEX OF A PORPHYRIN PHOTOSENSITIZER AND SULFUR DIOXIDE.
Claim 2
Dependent Claim
23 words
A COMPOSITION COMPRISING A PHOTOCHEMICALLY OXIDIZABLE POLYMR CONTAINING ALPHATIC CARBON-CARBON UNSATURATION AND AN ADDUT OR COMPLEX OF A PORPHYRIN PHOTOSENSITIZER AND SULFUR DIOXIDE.
Claim 3
Dependent Claim
12 words
The composition of claim 1 which contains a solvent for the polymer.
Claim 4
Dependent Claim
13 words
The composition of claim 1 in which the polymer is a styrene-butadiene copolymer.
Claim 5
Dependent Claim
15 words
The composition of claim 1 in which the polymer is a solid polymer of diolefin.
Claim 6
Dependent Claim
13 words
The composition of claim 1 in which the photosensitizer is an aryl porphyrin.
Claim 7
Dependent Claim
11 words
The composition of claim 1 in which the photosensitizer is tetraphenylporphin.
Claim 8
Dependent Claim
11 words
The composition of claim 4 in which the photosensitizer is tetraphenylporphin.
References Cited (Backward Citations)
US2437412A
Cited
US2950237A
Cited
US2951799A
Cited
US2951798A
Cited
US2951800A
Cited
US3790389A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-28 | 1979-01-27 | 1979-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-28 | 1983-01-27 | 1983-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-28 | 1987-01-27 | 1987-07-29 | $7700.00 | Window Closed / Lapsed |