US3227712A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydantoin derivatives of cephalosporin c
Assignee: Merck and Co Inc
•
Filing: 1963-04-09
•
Granted: 1966-01-04
•
Expires: 1983-04-09
Abstract
No abstract record available.
Inventors
- 👤 Arthur A Patchett
- 👤 Stanton A Harris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:31
CPC Classifications
C; C07; C07D; C07D501/00; C07D501/02; C07D501/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
15 words
A HYDANTOIN DERIVATIVE OF CEPHALOSPORIN C FROM THE GROUP CONSISTING OF COMPOUNDS OF THE FORMULA:
Claim 2
Dependent Claim
14 words
A PROCESS WHIC COMPRISES REACTING AN N-CARBAMYL DERIVATIVE OF CEPHALOSPORIN C OF THE FORMULA:
References Cited (Backward Citations)
US3117129A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-01-03 | 1969-07-05 | 1970-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-03 | 1973-07-05 | 1974-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-03 | 1977-07-05 | 1978-01-04 | $7700.00 | Window Closed / Lapsed |