US2680747A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of preparing 4-methyl-7-bis (beta-hydroxyethyl) amino coumarin
Assignee: GAF Chemicals Corp
•
Filing: 1951-05-19
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Granted: 1954-06-08
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Expires: 1971-05-19
Abstract
No abstract record available.
Inventors
- 👤 Williams William Wilson
- 👤 Freyermuth Harlan Benjamin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:03
CPC Classifications
C; C07; C07D; C07D311/00; C07D311/02; C07D311/04; C07D311/06; C07D311/08; C07D311/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2600375A
Cited
US2610152A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-06-07 | 1957-12-07 | 1958-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-06-07 | 1961-12-07 | 1962-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-06-07 | 1965-12-07 | 1966-06-08 | $7700.00 | Window Closed / Lapsed |