Patent US2721870A successfully refreshed from Google Patents.
US2721870A
Expired / Lapsed
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2,5-di-(hydroxy methyl) thiophenes
Assignee: Universal Oil Products Co
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Filing: 1952-02-29
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Granted: 1955-10-25
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Expires: 1972-02-29
Abstract
No abstract record available.
Inventors
- 👤 Pines Herman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:17
CPC Classifications
C; C07; C07D; C07D333/00; C07D333/02; C07D333/04; C07D333/06; C07D333/14; C07D333/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
22 words
A BIS-2,5-(HYDROXYMETHYL)-THIOPHENE HAVING IN EACH OF THE 3 AND 4 POSITIONS A MEMBER OF THE GROUP CONSISTING OF HYDROGEN, HALOGEN AND ALKYL.
Claim 2
Dependent Claim
22 words
A BIS-2,5-(HYDROXYMETHYL)-THIOPHENE HAVING IN EACH OF THE 3 AND 4 POSITIONS A MEMBER OF THE GROUP CONSISTING OF HYDROGEN, HALOGEN AND ALKYL.
References Cited (Backward Citations)
US2425721A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-10-24 | 1959-04-25 | 1959-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-24 | 1963-04-25 | 1963-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-24 | 1967-04-25 | 1967-10-25 | $7700.00 | Window Closed / Lapsed |