Patent US2846444A successfully refreshed from Google Patents.
US2846444A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pyruvic acid-3-(p-methoxy phenyl)-1, 2-dithiol-5-one azine
Assignee: Individual
•
Filing: 1952-12-17
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Granted: 1958-08-05
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Expires: 1972-12-17
Abstract
No abstract record available.
Inventors
- 👤 Luettringhaus Arthur
- 👤 Schmidt Ulrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:55
CPC Classifications
C; C07; C07D; C07D409/00; C07D409/02; C07D409/12; C07D339/00; C07D339/02; C07D339/04; C07D417/00; C07D417/02; C07D417/12; C09; C09B; C09B23/00; C09B23/16; C09B23/162
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
37 words
AS A NEW COMPOUND, A CONDENSATION PRODUCT OF PYRUVIC ACID AND 3-(P-METHOXY PHENYL) TRITHIONE WITH HYDRAZINE, SAID CONDENSATION PRODUCT HAVING CHOLERETIC ACTIVITY, AND PRODUCED BY BOILING IN GLACIAL ACETIC ACID WITH THE ADDITION OF A BASIC CATALYST.
Claim 2
Dependent Claim
37 words
AS A NEW COMPOUND, A CONDENSATION PRODUCT OF PYRUVIC ACID AND 3-(P-METHOXY PHENYL) TRITHIONE WITH HYDRAZINE, SAID CONDENSATION PRODUCT HAVING CHOLERETIC ACTIVITY, AND PRODUCED BY BOILING IN GLACIAL ACETIC ACID WITH THE ADDITION OF A BASIC CATALYST.
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) | 1961-08-04 | 1962-02-03 | 1962-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-04 | 1966-02-03 | 1966-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-04 | 1970-02-03 | 1970-08-05 | $7700.00 | Window Closed / Lapsed |