Patent US1919730A successfully refreshed from Google Patents.
US2983716A
Expired / Lapsed
US
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Rubber vulcanization acceleration
Assignee: Standard Oil Co
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Filing: 1958-03-26
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Granted: 1961-05-09
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Expires: 1978-03-26
Abstract
No abstract record available.
Inventors
- 👤 Ellis K Fields
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:38
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/0008; C08K5/0025
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
56 words
THE METHOD WHICH COMPRISES VULCANIZING A RUBBER SELECTED FROM THE CLASS CONSISTING OF NATURAL RUBBER AND BUTADIENE-STYRENE COPOLYMER SYNTHETIC RUBBER IN THE PRESENCE OF FROM 1% TO ABOUT 5%, BASED ON THE RUBBER, OF SULFUR, AND FROM ABOUT 0.1% TO ABOUT 3%, BASED ON THE RUBBER, OF A POLYSULFIDE DERIVATIVE OF 2,5-DIMERCAPTO1,3,4-THIADIAZOLE HAVING THE GENERAL FORMULA
Claim 2
Independent Claim
56 words
THE METHOD WHICH COMPRISES VULCANIZING A RUBBER SELECTED FROM THE CLASS CONSISTING OF NATURAL RUBBER AND BUTADIENE-STYRENE COPOLYMER SYNTHETIC RUBBER IN THE PRESENCE OF FROM 1% TO ABOUT 5%, BASED ON THE RUBBER, OF SULFUR, AND FROM ABOUT 0.1% TO ABOUT 3%, BASED ON THE RUBBER, OF A POLYSULFIDE DERIVATIVE OF 2,5-DIMERCAPTO1,3,4-THIADIAZOLE HAVING THE GENERAL FORMULA
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-05-08 | 1964-11-07 | 1965-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-08 | 1968-11-07 | 1969-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-08 | 1972-11-07 | 1973-05-09 | $7700.00 | Window Closed / Lapsed |