US2433802A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Quaternary ammonium salts of melamine-formaldehyde condensation products
Assignee: Wyeth Holdings LLC
•
Filing: 1943-02-12
•
Granted: 1947-12-30
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Expires: 1963-02-12
Abstract
No abstract record available.
Inventors
- 👤 Herbert J West
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:44
CPC Classifications
C; C08; C08G; C08G12/00; C08G12/02; C08G12/40
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2197357A
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US2211709A
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GB495830A
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US2264137A
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US2255901A
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US2326727A
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US2209292A
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US2339768A
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US2340044A
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US2377892A
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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) | 1950-12-29 | 1951-06-30 | 1951-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-12-29 | 1955-06-30 | 1955-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-12-29 | 1959-06-30 | 1959-12-30 | $7700.00 | Window Closed / Lapsed |