US2536989A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diazotype layers containing resorcinol derivatives
Assignee: GAF Chemicals Corp
•
Filing: 1948-01-20
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Granted: 1951-01-02
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Expires: 1968-01-20
Abstract
No abstract record available.
Inventors
- 👤 Glahn William H Von
- 👤 Lester N Stanley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 03:36
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/52; G03C1/58
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
62 words
IN THE PROCESS OF PREPARING DIAZOTYPE COPIES, THE STEP WHICH COMPRISES REACTING THE RESIDUAL LIGHT SENSITIVE DIAZO COMPOUND CONTAINED IN A LIGHT SENSITIVE DIAZOTYPE LAYER AFTER EXPOSURE THEREOF TO LIGHT IN A PRE-DETERMINED PATTERN, WITH A CARBONIC ESTER WHICH IS A REACTION PRODUCT OF 1 MOL OF PHOSGENE WITH 1 TO 2 MOLS OF RESORCINOL IN THE PRESENCE OF AN ALKALINE REAGENT.
Claim 2
Dependent Claim
62 words
IN THE PROCESS OF PREPARING DIAZOTYPE COPIES, THE STEP WHICH COMPRISES REACTING THE RESIDUAL LIGHT SENSITIVE DIAZO COMPOUND CONTAINED IN A LIGHT SENSITIVE DIAZOTYPE LAYER AFTER EXPOSURE THEREOF TO LIGHT IN A PRE-DETERMINED PATTERN, WITH A CARBONIC ESTER WHICH IS A REACTION PRODUCT OF 1 MOL OF PHOSGENE WITH 1 TO 2 MOLS OF RESORCINOL IN THE PRESENCE OF AN ALKALINE REAGENT.
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) | 1954-01-01 | 1954-07-03 | 1955-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-01 | 1958-07-03 | 1959-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-01 | 1962-07-03 | 1963-01-02 | $7700.00 | Window Closed / Lapsed |