US2828306A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stable water soluble salts of oestrone sulfate and process of making same
Assignee: Bayer Pharma AG
•
Filing: 1957-10-21
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Granted: 1958-03-25
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Expires: 1977-10-21
Abstract
No abstract record available.
Inventors
- 👤 Griebsch Eugen
- 👤 Zuehlsdorff Gerhard
- 👤 Pirner Klaus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:42
CPC Classifications
C; C07; C07J; C07J31/00; C07J75/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
17 words
QUATERNARY AMMONIUM SALTS OF OESTRONE SULFATE, WHICH ARE DERIVED FROM QUATERNARY AMMONIUM BASES HAVING THE GENERAL FORMULA
Claim 2
Dependent Claim
17 words
QUATERNARY AMMONIUM SALTS OF OESTRONE SULFATE, WHICH ARE DERIVED FROM QUATERNARY AMMONIUM BASES HAVING THE GENERAL FORMULA
References Cited (Backward Citations)
US2200114A
Cited
US2642427A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-03-24 | 1961-09-23 | 1962-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-24 | 1965-09-23 | 1966-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-24 | 1969-09-23 | 1970-03-25 | $7700.00 | Window Closed / Lapsed |