US2272489A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nitrogenous condensation products and a process of producing same
Assignee: GAF Chemicals Corp
•
Filing: 1936-08-01
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Granted: 1942-02-10
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Expires: 1956-08-01
Abstract
No abstract record available.
Inventors
- 👤 Ulrich Heinrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:18
CPC Classifications
D; D01; D01F; D01F1/00; D01F1/02; D01F1/10; C; C07; C07D; C07D203/00; C07D203/04; C07D203/06; C07D203/08; C07D203/12; C08; C08G; C08G73/00; C08G73/02; C08G73/0206; C08G73/0213; D01F2/00; D01F2/06; D01F2/08; D01F2/10; D06; D06M; D06M15/00; D06M15/19; D06M15/37; D06M15/61; Y; Y10; Y10S; Y10S260/00; Y10S260/38; Y10S516/00; Y10S516/01; Y10S516/07
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1945-02-09 | 1945-08-11 | 1946-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-02-09 | 1949-08-11 | 1950-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-02-09 | 1953-08-11 | 1954-02-10 | $7700.00 | Window Closed / Lapsed |