US3219662A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transformation products of cephalosporin c and derivatives thereof
Assignee: National Research Development Corp UK
•
Filing: 1962-04-30
•
Granted: 1965-11-23
•
Expires: 1982-04-30
Abstract
No abstract record available.
Inventors
- 👤 Abraham Edward Penley
- 👤 Newton Guy Geoffrey Frederick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:24
CPC Classifications
C; C07; C07D; C07D501/00; C07D501/14; C07D501/16; C07D501/20; C07D501/02; C07D501/04; C07D501/06; C07D501/18; C07D501/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
55 words
AN ANTIBIOTICALLY-ACTIVE N-ACYL DERIVATIVE OF A COMPOUND SELECTED FROM THE GROUP CONSITING OF THE NUCLEUS OF CEPHALOSPORIN C, CEPHALOSPORIN CC AND CEPHALOSPORIN CA COMPOUNDS WHEREIN THE BASE IS A HETEROCYCLIC, WEAK, TERTIARY BASE HAVING A CYCLIC STRUCTURE CONTAINING AT LEAST ONE NITROGEN HETEROATOM AND IS LINKED TO CH2 VIA A NITROGEN HETEROATOM, OF THE FORMULA
Claim 2
Dependent Claim
55 words
AN ANTIBIOTICALLY-ACTIVE N-ACYL DERIVATIVE OF A COMPOUND SELECTED FROM THE GROUP CONSITING OF THE NUCLEUS OF CEPHALOSPORIN C, CEPHALOSPORIN CC AND CEPHALOSPORIN CA COMPOUNDS WHEREIN THE BASE IS A HETEROCYCLIC, WEAK, TERTIARY BASE HAVING A CYCLIC STRUCTURE CONTAINING AT LEAST ONE NITROGEN HETEROATOM AND IS LINKED TO CH2 VIA A NITROGEN HETEROATOM, OF THE FORMULA
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-11-22 | 1969-05-24 | 1969-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-22 | 1973-05-24 | 1973-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-22 | 1977-05-24 | 1977-11-23 | $7700.00 | Window Closed / Lapsed |