US3513170A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of 2,2,6,6-tetramethyl-4-oxopiperidine
Assignee: Sankyo Co Ltd
•
Filing: 1967-07-19
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Granted: 1970-05-19
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Expires: 1987-07-19
Abstract
No abstract record available.
Inventors
- 👤 Keisuke Murayama
- 👤 Syoji Morimura
- 👤 Toshimasa Toda
- 👤 Eiko Yamao
- 👤 Tomizi Tsuzi
- 👤 Susumu Higashida
- 👤 Osamu Amakasu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:56
CPC Classifications
C; C07; C07D; C07D221/00; C07D221/02; C07D221/20; C07D211/00; C07D211/02; C07D211/04; C07D211/68; C07D211/72; C07D211/74; C07D471/00; C07D471/02; C07D471/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1473285A
Cited
US3126393A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-05-18 | 1973-11-17 | 1974-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-05-18 | 1977-11-17 | 1978-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-05-18 | 1981-11-17 | 1982-05-19 | $7700.00 | Window Closed / Lapsed |