Patent US2764750A successfully refreshed from Google Patents.
US2854338A
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Negative working diazo sulfonate foils
Assignee: GAF Chemicals Corp
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Filing: 1955-03-18
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Granted: 1958-09-30
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Expires: 1975-03-18
Abstract
No abstract record available.
Inventors
- 👤 Jr Clifford E Herrick
- 👤 Ann H Balk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:05
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/56; C25D3/58; G; G03; G03C; G03C1/00; G03C1/52; G03C1/56
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
A NEGATIVE WORKING DIAZO SULFONATE MATRIAL COMPRISING A TRANSPARENT BASE CARRYING A LAYER OF A MIXTURE OF A COPOLYMER OF MALEIC ANHYDRIDE WITH A VINYL COMPOUND AND A HYDROPHOBIC RESIN COMPATIBLE WITH SAID COPOLYMER, SAID COPOLYMER HAVING BEEN SURFACE HYDROLYZED WITH A MOIST WATER SOLUBLE NITROGENOUS BASE TO RENDER IT HYDROPHILIC AND A LIGHT SENSITIVE DIAZO SULFONATE IN WHICH THE SULFONATE GROUP IS DIRECTLY ATTACHED TO A NITROGEN ATOM OF THE AZO GROUP AND A COUPLING COMPONENT IMBIBED TO SAID LAYER.
Claim 2
Dependent Claim
81 words
A NEGATIVE WORKING DIAZO SULFONATE MATRIAL COMPRISING A TRANSPARENT BASE CARRYING A LAYER OF A MIXTURE OF A COPOLYMER OF MALEIC ANHYDRIDE WITH A VINYL COMPOUND AND A HYDROPHOBIC RESIN COMPATIBLE WITH SAID COPOLYMER, SAID COPOLYMER HAVING BEEN SURFACE HYDROLYZED WITH A MOIST WATER SOLUBLE NITROGENOUS BASE TO RENDER IT HYDROPHILIC AND A LIGHT SENSITIVE DIAZO SULFONATE IN WHICH THE SULFONATE GROUP IS DIRECTLY ATTACHED TO A NITROGEN ATOM OF THE AZO GROUP AND A COUPLING COMPONENT IMBIBED TO SAID LAYER.
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) | 1961-09-29 | 1962-03-31 | 1962-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-29 | 1966-03-31 | 1966-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-29 | 1970-03-31 | 1970-09-30 | $7700.00 | Window Closed / Lapsed |