Patent US2546267A successfully refreshed from Google Patents.
US2546267A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of grisein
Assignee: Merck and Co Inc
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Filing: 1948-11-04
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Granted: 1951-03-27
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Expires: 1968-11-04
Abstract
No abstract record available.
Inventors
- 👤 Jr Frederick A Kuehl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 22:01
CPC Classifications
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Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
44 words
THE PROCESS FOR PURIFYING GRISEIN, WHICH COMPRISES CONTACTING AN AQUEOUS SOLUTION OF HIGH POTENCY GRISEIN WITH SILVER OXIDE, THEREBY ADSORBING THE IMPURITIES PRESENT IN SAID SOLUTION ON SAID SILVER OXIDE, REMOVING SAID SILVER OXIDE AND RECOVERING WITH A PHENOL-CHLOROFORM MIXTURE AND PRECIPITATION WITH ETHER.
Claim 2
Dependent Claim
44 words
THE PROCESS FOR PURIFYING GRISEIN, WHICH COMPRISES CONTACTING AN AQUEOUS SOLUTION OF HIGH POTENCY GRISEIN WITH SILVER OXIDE, THEREBY ADSORBING THE IMPURITIES PRESENT IN SAID SOLUTION ON SAID SILVER OXIDE, REMOVING SAID SILVER OXIDE AND RECOVERING WITH A PHENOL-CHLOROFORM MIXTURE AND PRECIPITATION WITH ETHER.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-03-26 | 1954-09-25 | 1955-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-03-26 | 1958-09-25 | 1959-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-03-26 | 1962-09-25 | 1963-03-27 | $7700.00 | Window Closed / Lapsed |