US3640718A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spectral sentization of photosensitive compositions
Assignee: 3M Co
•
Filing: 1968-04-10
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Granted: 1972-02-08
•
Expires: 1988-04-10
Abstract
Abstract As a spectral sensitizer for photosensitive compositions containing a photolyzable organic halogen compound, at least one aromatic polycyclic compound having an ionization potential below about 7.4 is used. Preferred are colored, linear fused-ring polynuclear carbocyclic compounds (acenes) which are essentially unreactive with the organic halogen in the dark under room conditions.
Inventors
- 👤 George H Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:40
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/26; G03F7/28; G03C; G03C1/00; G03C1/675; G03F7/004; G03F7/027; G03F7/028; G03F7/029; G03F7/0295; G03G; G03G5/00; G03G5/02; G03G5/026; Y; Y10; Y10S; Y10S430/00; Y10S430/1053; Y10S430/1055; Y10S430/114; Y10S430/12; Y10S430/126; Y10S430/127
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
19 words
The photosensitive composition of claim 1 in which said photolyzable organic halogen compounds are nongaseous compounds at room temperature.
Claim 2
Dependent Claim
30 words
The photosensitive composition of claim 1 in which said composition contains a compound which undergoes a chemical change in the presence of either a free radical halogen or an acid.
Claim 3
Dependent Claim
16 words
The photosensitive composition of claim 1 in which said composition contains a free radical polymerizable monomer.
Claim 4
Dependent Claim
15 words
The photosensitive composition of claim 1 in which said composition contains an acid polymerizable monomer.
Claim 5
Dependent Claim
33 words
The photosensitive composition of claim 1 in which said composition contains a compound which is capable of changing color in the acid environment created upon light exposure of a photolyzable organic halogen compound.
Claim 6
Dependent Claim
24 words
The photosensitive composition of claim 1 in which the molar ratio of said sensitizer to said organic halogen compound is from 1/20 to 2/1.
Claim 7
Dependent Claim
28 words
The photosensitive composition of claim 1 in which said acene compound is free of amine groups which react with said organic halogen compound in the absence of light.
Claim 8
Dependent Claim
10 words
A photosensitive layer containing the photosensitive composition of claim 1.
References Cited (Backward Citations)
US3526506A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-07 | 1975-08-09 | 1976-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-07 | 1979-08-09 | 1980-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-07 | 1983-08-09 | 1984-02-08 | $7700.00 | Window Closed / Lapsed |