Patent US2890515A successfully refreshed from Google Patents.
US2789904A
Expired / Lapsed
US
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Diazo print process
Assignee: GAF Chemicals Corp
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Filing: 1953-09-17
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Granted: 1957-04-23
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Expires: 1973-09-17
Abstract
No abstract record available.
Inventors
- 👤 Charles H Benbrook
- 👤 Jr Clifford E Herrick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:34
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
THE PROCESS OF PREPARING DIAZO PRINTS FROM A MATERIAL SENSITIZED BY MEANS OF A LIGHT SENSTIVE DIAZO COMPOUND WHICH COMPRISES EXPOSING SAID MATERIAL TO ACTINIC LIGHT UNDER A PATTERN, THEN CONTACTING THE EXPOSED MATERIAL WITH AN ABSORBENT LAYER CONTAINING A COUPLER CAPABLE OF THERMAL TRANSFER AND SELECTED FROM THE GROUP CONSISTING OF PHENOLS, NAPHTHOLS, AND COMPOUNDS CONTAINING A REACTIVE METHYLENE GROUP, SAID COUPLER BEING FREE FROM PRIMARY AMINO GROUPS, AND HEATING SAID MATERIAL AT A TEMPERATURE BETWEEN 140*C. AND 225%C. WHILE IN CONTACT WITH SAID COUPLER CONTAINING LAYER IN THE PRESENCE OF STEAM.
Claim 2
Dependent Claim
93 words
THE PROCESS OF PREPARING DIAZO PRINTS FROM A MATERIAL SENSITIZED BY MEANS OF A LIGHT SENSTIVE DIAZO COMPOUND WHICH COMPRISES EXPOSING SAID MATERIAL TO ACTINIC LIGHT UNDER A PATTERN, THEN CONTACTING THE EXPOSED MATERIAL WITH AN ABSORBENT LAYER CONTAINING A COUPLER CAPABLE OF THERMAL TRANSFER AND SELECTED FROM THE GROUP CONSISTING OF PHENOLS, NAPHTHOLS, AND COMPOUNDS CONTAINING A REACTIVE METHYLENE GROUP, SAID COUPLER BEING FREE FROM PRIMARY AMINO GROUPS, AND HEATING SAID MATERIAL AT A TEMPERATURE BETWEEN 140*C. AND 225%C. WHILE IN CONTACT WITH SAID COUPLER CONTAINING LAYER IN THE PRESENCE OF STEAM.
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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) | 1960-04-22 | 1960-10-22 | 1961-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-22 | 1964-10-22 | 1965-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-22 | 1968-10-22 | 1969-04-23 | $7700.00 | Window Closed / Lapsed |