US3823191A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tetrakis(3-mercaptopropyl)ether of pentaerythritol,c(ch2och2ch2ch2sh)4
Assignee: WR Grace and Co Conn
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Filing: 1972-11-17
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Granted: 1974-07-09
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Expires: 1992-11-17
Abstract
Abstract THIOACETIC ACID IS ADDED PHOTOCHEMICALLY, OR IN PRESENCE OF A HYDROPEROXIDE, TO TETRALLYL ETHER OF PENTAERYTHRITOL TO PREPARE PENTAERYTHRITOL TETRAKIS (3-THIOACETOXY-PROPYL) ETHER, WHICHIS THEN HYDROLYZED WITH SODIUM HYDROXIDE SOLUTION TO GIVE A POLYTHIOL, TETRAKIS (3MERCAPTOPROPYL) ETHER OF PENTAERYTHRITOL.
Inventors
- 👤 S Dighe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:54
CPC Classifications
C; C08; C08G; C08G75/00; C08G75/12; C07; C07C; C07C323/00; C07C327/00; C08G18/00; C08G18/06; C08G18/83; C08G18/834; C08G18/835
Claims Analysis
Total Claims: 0
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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) | 1977-07-08 | 1978-01-07 | 1978-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-08 | 1982-01-07 | 1982-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-08 | 1986-01-07 | 1986-07-09 | $7700.00 | Window Closed / Lapsed |