Patent US3140180A successfully refreshed from Google Patents.
US3140180A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat developable diazotype reproduction coatings comprising thermolabile carboxylic tertiary alkyl esters
Assignee: Keuffel and Esser Co
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Filing: 1960-04-22
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Granted: 1964-07-07
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Expires: 1980-04-22
Abstract
No abstract record available.
Inventors
- 👤 Fritz Gerhard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:08
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/52; G03C1/58; C; C07; C07D; C07D207/00; C07D207/02; C07D207/30; C07D207/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
52 words
A HEAT DEVELOPABLE DIAZO TYPE MATERIAL COMPRISING A BASE AND A COATING ON SAID BASE SAID COATING COMPRISING A DIZAONIUM COMPOUND AND A THERMOLABLILE PYRROLE COMPOUND HAVING A CARBOXYLIC ACID TERTIARY ALKYL ESTER GROUP WHICH PYRROLE COMPOUND UPON HEATING DECOMPOSES TO FORM A COUPLER TO TRANSFORM THE DIAZO COMPOUND TO AN AZO-DYESTUFF.
Claim 2
Dependent Claim
52 words
A HEAT DEVELOPABLE DIAZO TYPE MATERIAL COMPRISING A BASE AND A COATING ON SAID BASE SAID COATING COMPRISING A DIZAONIUM COMPOUND AND A THERMOLABLILE PYRROLE COMPOUND HAVING A CARBOXYLIC ACID TERTIARY ALKYL ESTER GROUP WHICH PYRROLE COMPOUND UPON HEATING DECOMPOSES TO FORM A COUPLER TO TRANSFORM THE DIAZO COMPOUND TO AN AZO-DYESTUFF.
References Cited (Backward Citations)
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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) | 1967-07-07 | 1968-01-06 | 1968-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-07 | 1972-01-06 | 1972-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-07 | 1976-01-06 | 1976-07-07 | $7700.00 | Window Closed / Lapsed |