US3484489A
Expired / Lapsed
US
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Synthesis of hydroxyclopenten-1-ones
Assignee: F Hoffmann La Roche AG
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Filing: 1968-02-19
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Granted: 1969-12-16
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Expires: 1988-02-19
Abstract
No abstract record available.
Inventors
- 👤 Richard Wightman Kierstead
- 👤 Ronald Andrew Lemahieu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:45
CPC Classifications
C; C07; C07C; C07C49/00; C07C49/587; C07C49/703; C07C49/743; C07C1/00; C07C1/20; C07C1/24; C07C35/00; C07C35/02; C07C35/06; C07C45/00; C07C45/61; C07C45/64; C07C2531/00; C07C2531/02; C07C2531/025; C07C2601/00; C07C2601/06; C07C2601/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR1434224A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-12-15 | 1973-06-16 | 1973-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-12-15 | 1977-06-16 | 1977-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-12-15 | 1981-06-16 | 1981-12-16 | $7700.00 | Window Closed / Lapsed |