US2815342A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synthesis of pyrimidine nucleoside phosphates
Assignee: Canadian Patents and Development Ltd
•
Filing: 1955-03-04
•
Granted: 1957-12-03
•
Expires: 1975-03-04
Abstract
No abstract record available.
Inventors
- 👤 Har G Khorana
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:09
CPC Classifications
C; C07; C07H; C07H1/00; C07H1/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
27 words
A PROCESS FOR THE PREPARATION OF A PYRIMIDINE NUCLEOSIDE 5'' MONOPHOSPHATE WHICH COMPRISES RACTING A 2'',3''-ISOPROPYLIDENE PRYIMIDINE NUCLEOSIDE WITH A MIXTURE OF PHOSPHORUS PENTOXIDE AND PHOSPHORIC ACID.
Claim 2
Dependent Claim
27 words
A PROCESS FOR THE PREPARATION OF A PYRIMIDINE NUCLEOSIDE 5'' MONOPHOSPHATE WHICH COMPRISES RACTING A 2'',3''-ISOPROPYLIDENE PRYIMIDINE NUCLEOSIDE WITH A MIXTURE OF PHOSPHORUS PENTOXIDE AND PHOSPHORIC ACID.
References Cited (Backward Citations)
US2052029A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-12-02 | 1961-06-03 | 1961-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-02 | 1965-06-03 | 1965-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-02 | 1969-06-03 | 1969-12-03 | $7700.00 | Window Closed / Lapsed |