Patent US4307173A successfully refreshed from Google Patents.
US4307173A
Expired / Lapsed
US
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Light-sensitive composition comprising phthalic anhydride
Assignee: CNA Holdings LLC
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Filing: 1981-02-12
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Granted: 1981-12-22
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Expires: 2001-02-12
Abstract
Abstract Disclosed is an improved photosensitive composition having increased light sensitivity. Said composition comprises an O-quinone diazide, phthalic anhydride and an aromatic sulfonic acid.
Inventors
- 👤 Henry W. Gventer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:35
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/022; G03F7/0226
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
34 words
A composition comprising phthalic anhydride, an aromatic sulfonic acid and an o-quinone diazide, said phthalic anhydride and said aromatic sulfonic acid are present in amounts sufficient to increase the light sensitivity of said composition.
Claim 2
Dependent Claim
34 words
A composition comprising phthalic anhydride, an aromatic sulfonic acid and an o-quinone diazide, said phthalic anhydride and said aromatic sulfonic acid are present in amounts sufficient to increase the light sensitivity of said composition.
Claim 3
Dependent Claim
14 words
The composition of claim 1 wherein said aromatic sulfonic acid is p-toluene sulfonic acid.
Claim 4
Dependent Claim
14 words
The composition of claim 1, further comprising one or more alkali soluble oleophilic resins.
Claim 5
Dependent Claim
14 words
The composition of claim 2 further comprising one or more alkali soluble oleophilic resins.
Claim 6
Dependent Claim
11 words
The composition of claim 1 further comprising one or more dyes.
Claim 7
Dependent Claim
11 words
The composition of claim 2 further comprising one or more dyes.
Claim 8
Dependent Claim
11 words
The composition of claim 3 further comprising one or more dyes.
Claim 9
Dependent Claim
11 words
The composition of claim 4 further comprising one or more dyes.
Claim 10
Dependent Claim
42 words
The composition of claim 8 comprising in parts by weight, from 30% to 50% o-quinone diazide, from 6% to 50% phthalic anhydride, from 0% to 10% alkali soluble oleophilic resins, up to 10% p-toluene sulfonic acid and from 0% to 40% dyes.
Claim 11
Dependent Claim
34 words
A photographic element comprising a substrate and a coating on at least one side of said substrate, said coating comprising the composition of claim 1, 2, 3, 4, 5, 6, 7, 8, or 9.
Claim 12
Dependent Claim
30 words
A photographic element comprising a transparent substrate and a coating on at least one side of said substrate, said coating comprising the composition of claim 1, 2, 8 or 9.
Claim 13
Dependent Claim
30 words
A photographic element comprising a metallic substrate and a coating on at least one side of said substrate, said coating comprising the composition of claim 1, 2, 8 or 9.
Claim 14
Dependent Claim
17 words
The composition of claim 8 or 9 wherein said alkali soluble oleophilic resin is a phenol-formaldehyde resin.
Claim 15
Dependent Claim
9 words
The composition of claim 1 further comprising phthalic acid.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-12-21 | 1985-06-22 | 1985-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-21 | 1989-06-22 | 1989-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-21 | 1993-06-22 | 1993-12-22 | $7700.00 | Window Closed / Lapsed |