US2921076A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heterocyclic compounds and methods for producing the same
Assignee: Parke Davis and Co LLC
•
Filing: 1958-01-22
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Granted: 1960-01-12
•
Expires: 1978-01-22
Abstract
No abstract record available.
Inventors
- 👤 Robert F Parcell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:36
CPC Classifications
C; C07; C07D; C07D307/00; C07D307/02; C07D307/34; C07D307/38; C07D307/52; C07D333/00; C07D333/02; C07D333/04; C07D333/06; C07D333/14; C07D333/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
21 words
A COMPOUND OF THE CLASS CONSISTING OF A FREE BASE AND ITS ACID ADDITION SALTS, SAID FREE BASE HAVING THE FORMULA,
Claim 2
Dependent Claim
21 words
A COMPOUND OF THE CLASS CONSISTING OF A FREE BASE AND ITS ACID ADDITION SALTS, SAID FREE BASE HAVING THE FORMULA,
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) | 1963-01-11 | 1963-07-13 | 1964-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-11 | 1967-07-13 | 1968-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-11 | 1971-07-13 | 1972-01-12 | $7700.00 | Window Closed / Lapsed |