Patent US3513113A successfully refreshed from Google Patents.
US3513113A
Expired / Lapsed
US
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Production of self-extinguishing polyurethanes
Assignee: Chemische Fabrik Kalk GmbH
•
Filing: 1965-12-28
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Granted: 1970-05-19
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Expires: 1985-12-28
Abstract
No abstract record available.
Inventors
- 👤 Hans Eberhard Praetzel
- 👤 Herbert Jenkner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 10:47
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/30; C08G18/38; C08G18/3802; C08G18/3804; C08G18/3806; C08G18/381; C08G18/40; C08G18/48; C08G18/50; C08G18/5003; C08G18/5006; C08G18/5012; C08G18/5075; C08G18/5078
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
CA704146A
Cited
CA740030A
Cited
US3072582A
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US3131115A
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FR1246971A
Cited
US3252922A
Cited
US3245922A
Cited
GB995046A
Cited
US3264233A
Cited
US3249562A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-05-18 | 1973-11-17 | 1974-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-05-18 | 1977-11-17 | 1978-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-05-18 | 1981-11-17 | 1982-05-19 | $7700.00 | Window Closed / Lapsed |