Patent US2276309A successfully refreshed from Google Patents.
US2276309A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Formaldehyde-polyalkylene polyamine condensation products and production thereof
Assignee: GAF Chemicals Corp
•
Filing: 1937-03-19
•
Granted: 1942-03-17
•
Expires: 1957-03-19
Abstract
No abstract record available.
Inventors
- 👤 Hummel Hans Georg
- 👤 Jahrstorfer Michael
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:30
CPC Classifications
C; C08; C08G; C08G12/00; C08G12/02; C08G12/04; C08G12/06
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1945-03-16 | 1945-09-15 | 1946-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-03-16 | 1949-09-15 | 1950-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-03-16 | 1953-09-15 | 1954-03-17 | $7700.00 | Window Closed / Lapsed |