US2520127A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of purifying rutin
Assignee: Individual
•
Filing: 1947-10-31
•
Granted: 1950-08-29
•
Expires: 1967-10-31
Abstract
No abstract record available.
Inventors
- 👤 James F Couch
- 👤 Naghski Joseph
- 👤 William L Porter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:49
CPC Classifications
C; C07; C07H; C07H17/00; C07H17/04; C07H17/06; C07H17/065; C07H17/07
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
33 words
IN THE METHOD OF SEPARATING RUTIN FROM MIXTURES OF IT AND IMPURITIES, DISSOLVING THE MIXTURE IN A LOWER SUBSTANTIALLY ANHYDROUS ALIPHATIC ALCOHOL TO PRODUCE A RUTIN ALCOHOLATE, AND SEPARATING THE FORMED RUTIN ALCOHOLATE.
Claim 2
Dependent Claim
33 words
IN THE METHOD OF SEPARATING RUTIN FROM MIXTURES OF IT AND IMPURITIES, DISSOLVING THE MIXTURE IN A LOWER SUBSTANTIALLY ANHYDROUS ALIPHATIC ALCOHOL TO PRODUCE A RUTIN ALCOHOLATE, AND SEPARATING THE FORMED RUTIN ALCOHOLATE.
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) | 1953-08-28 | 1954-02-27 | 1954-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-08-28 | 1958-02-27 | 1958-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-08-28 | 1962-02-27 | 1962-08-29 | $7700.00 | Window Closed / Lapsed |