Patent US2535706A successfully refreshed from Google Patents.
US2535706A
Expired / Lapsed
US
⏱️ 0.0 years remaining
4-methyl-1,2-dithia-4-cyclopentene-3-thione
Assignee: Gulf Research and Development Co
•
Filing: 1947-03-07
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Granted: 1950-12-26
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Expires: 1967-03-07
Abstract
No abstract record available.
Inventors
- 👤 Donald R Stevens
- 👤 Arthur C Whitaker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:11
CPC Classifications
C; C07; C07D; C07D339/00; C07D339/02; C07D339/04; C10; C10L; C10L1/00; C10L1/10; C10L1/14; C10L1/24; C10L1/2443; C10L1/245
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
10 words
AS A NEW CHEMICAL COMPOUND, THE ORANGECOLORED CRYSTALLINE SOLID, 4-METHYL-1,2-DITHIA-4CYCLOPENTENE-3-THIONE.
Claim 2
Dependent Claim
10 words
AS A NEW CHEMICAL COMPOUND, THE ORANGECOLORED CRYSTALLINE SOLID, 4-METHYL-1,2-DITHIA-4CYCLOPENTENE-3-THIONE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-12-25 | 1954-06-26 | 1954-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-12-25 | 1958-06-26 | 1958-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-12-25 | 1962-06-26 | 1962-12-26 | $7700.00 | Window Closed / Lapsed |