US2554472A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of preparing 21-iodo-pregnene-(5)-ol-(3)-one-(20)
Assignee: Hoechst AG
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Filing: 1949-04-27
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Granted: 1951-05-22
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Expires: 1969-04-27
Abstract
No abstract record available.
Inventors
- 👤 Ruschig Heinrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:26
CPC Classifications
C; C07; C07J; C07J75/00; C07J1/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
42 words
A PROCESS OF PREPARING 21-IODO-PREGNENE (5)-01-(3)-ONE-(20) WHICH COMPRISES TREATING PREGNENE-(5)-01-(3)-ONE-(20) OXALIC ACID-(21) IN THE FORM OF ITS ALKALI SALTS WITH IODINE IN THE ABSENCE OF WATER AT A LOW TEMPERATURE IN A SOLVENT MIXABLE WITH WATER AND ADDING AN ALKALINE SALT SOLUTION.
Claim 2
Dependent Claim
42 words
A PROCESS OF PREPARING 21-IODO-PREGNENE (5)-01-(3)-ONE-(20) WHICH COMPRISES TREATING PREGNENE-(5)-01-(3)-ONE-(20) OXALIC ACID-(21) IN THE FORM OF ITS ALKALI SALTS WITH IODINE IN THE ABSENCE OF WATER AT A LOW TEMPERATURE IN A SOLVENT MIXABLE WITH WATER AND ADDING AN ALKALINE SALT SOLUTION.
References Cited (Backward Citations)
FR891441A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-21 | 1954-11-20 | 1955-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-21 | 1958-11-20 | 1959-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-21 | 1962-11-20 | 1963-05-22 | $7700.00 | Window Closed / Lapsed |