Patent US3828052A successfully refreshed from Google Patents.
US3828052A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acyl hydrazones of 2,2,6,6-tetramethyl-piperidine-4-ones
Assignee: Novartis Corp
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Filing: 1971-09-20
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Granted: 1974-08-06
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Expires: 1991-09-20
Abstract
Abstract ACYL HYDRAZONE DERIVATIVES OF 2,26,6-TETRAMETHYLPIPERIDINE-4-ONE ARE STABILIZERS OF ORGANIC MATERIALS. THEY ARE PREPARED BY REATING A CORRESPONDING ACID HYDRAZIDE WITH TRIA ONAMINE.
Inventors
- 👤 J Jack
- 👤 B Holt
- 👤 D Randell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:01
CPC Classifications
C; C07; C07D; C07D211/00; C07D211/04; C07D211/68; C07D211/72; C08; C08K; C08K5/00; C08K5/16; C08K5/34; C08K5/3412; C08K5/3432; C08K5/3435; C08K5/36; C08K5/37; C08K5/378
Claims Analysis
Total Claims: 0
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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) | 1977-08-05 | 1978-02-04 | 1978-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-05 | 1982-02-04 | 1982-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-05 | 1986-02-04 | 1986-08-06 | $7700.00 | Window Closed / Lapsed |