US3027256A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of light-sensitive diazotype materials
Assignee: Eugene Dietzgen Co
•
Filing: 1957-11-22
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Granted: 1962-03-27
•
Expires: 1977-11-22
Abstract
No abstract record available.
Inventors
- 👤 Robert J Klimkowski
- 👤 Ernest A Kahn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:40
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/52; G03C1/61
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
80 words
A PROCESS FOR PRODUCING A POSITIVE PRINT WHICH COMPRISES APPLYING TO THE SURFACE OF A BASE AN AQUEOUS SOLUTION CONTAINING A LIGHT-SENSITIVE STABLE DIAZONIUM DOUBLE SALT, AN AZO COUPLING COMPOUND, AND FROM ABOUT 1% TO ABOUT 20% OF TETRAHYDROFURFURYL ALCOHOL BY VOLUME BASED ON THE VOLUME OF WATER IN THE SOLUTION; DRYING THE WETCOATED BASE TO REMOVE VOLATILES; EXPOSING SAID LIGHT-SENSITIVE MATERIAL TO LIGHT UNDER A DESIGN; AND THEREAFTER DEVELOPING THE PRINT BY CONTACTING THE COATED BASE WITH AMMONIA VAPOR.
References Cited (Backward Citations)
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Cited
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US2623821A
Cited
US2662013A
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US2826501A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-03-26 | 1965-09-25 | 1966-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-03-26 | 1969-09-25 | 1970-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-03-26 | 1973-09-25 | 1974-03-27 | $7700.00 | Window Closed / Lapsed |