US2501874A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic diazo-sensitized glassine paper
Assignee: GAF Chemicals Corp
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Filing: 1946-06-12
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Granted: 1950-03-28
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Expires: 1966-06-12
Abstract
No abstract record available.
Inventors
- 👤 Willard D Peterson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:56
CPC Classifications
F; F17; F17C; F17C1/00; F17C1/02; F17C1/04; F17C1/06; G; G03; G03C; G03C1/00; G03C1/52
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
73 words
TRANSPARENT DIAZOTYPE MATERIALS PARTICULARLY SUITABLE FOR THE PREPARATION OF INTERMEDIATE OR TRANSITION PRINTS COMPRISING A GLASSINE PAPER BASE HAVING APPLIED TO BOTH FACES THEREOF A SENSITIZING COMPOSITION COMPRISING A LIGHT-SENSITIVE DIAZO COMPOUND, A SMALL QUANTITY OF A RESINOUS LOW VISCOSITY CELLULOSE ESTER FILM FORMING MATERIAL AND A PHENOLIC COUPLING COMPONENT CAPABLE OF YIELDING WITH THE DIAZO COMPOUND AN AZO DYE HAVING A TONE SELECTED FROM THE CLASS CONSISTING OF YELLOW AND SEPIA TONES.
Claim 2
Dependent Claim
73 words
TRANSPARENT DIAZOTYPE MATERIALS PARTICULARLY SUITABLE FOR THE PREPARATION OF INTERMEDIATE OR TRANSITION PRINTS COMPRISING A GLASSINE PAPER BASE HAVING APPLIED TO BOTH FACES THEREOF A SENSITIZING COMPOSITION COMPRISING A LIGHT-SENSITIVE DIAZO COMPOUND, A SMALL QUANTITY OF A RESINOUS LOW VISCOSITY CELLULOSE ESTER FILM FORMING MATERIAL AND A PHENOLIC COUPLING COMPONENT CAPABLE OF YIELDING WITH THE DIAZO COMPOUND AN AZO DYE HAVING A TONE SELECTED FROM THE CLASS CONSISTING OF YELLOW AND SEPIA TONES.
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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) | 1953-03-27 | 1953-09-26 | 1954-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-27 | 1957-09-26 | 1958-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-27 | 1961-09-26 | 1962-03-28 | $7700.00 | Window Closed / Lapsed |