US3159629A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synthesis of pteridines
Assignee: Smith Kline & French Laboratories Ltd
•
Filing: 1962-08-07
•
Granted: 1964-12-01
•
Expires: 1982-08-07
Abstract
No abstract record available.
Inventors
- 👤 Irwin J Pachter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:04
CPC Classifications
C; C07; C07D; C07D475/00; C07D475/06; C07D475/08; C07D239/00; C07D239/02; C07D239/24; C07D239/28; C07D239/46; C07D239/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
22 words
THE PROCESS OF PREPARING PTERIDINE DERIVATIVES COMPRISING REACTING IN THE PRESENCE OF A BASIC CONDENSING AGENT A POLYACETYLATED PYRIMIDINE OF THE STRUCTURE:
Claim 2
Dependent Claim
22 words
THE PROCESS OF PREPARING PTERIDINE DERIVATIVES COMPRISING REACTING IN THE PRESENCE OF A BASIC CONDENSING AGENT A POLYACETYLATED PYRIMIDINE OF THE STRUCTURE:
References Cited (Backward Citations)
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US2785163A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-12-01 | 1968-06-01 | 1968-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-12-01 | 1972-06-01 | 1972-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-12-01 | 1976-06-01 | 1976-12-01 | $7700.00 | Window Closed / Lapsed |