Patent US3661788A successfully refreshed from Google Patents.
US3661788A
Expired / Lapsed
US
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Stabilization of methylchloroform
Assignee: Imperial Chemical Industries Ltd
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Filing: 1969-07-28
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Granted: 1972-05-09
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Expires: 1989-07-28
Abstract
Abstract METHYLCHLOROFORM IS STABLIZED WITH A SMALL AMOUNT OF PYRAN, DIHYDROPYRAN AND TETRAHYDROPYRAN, SUBSTITUTED IN ANY ONE OF THE 2,3,4,5 AND 6 POSITIONS BY AN -OR GROUP WHEREIN R IS HYDROGEN, LOWER ALKYL, PYRANYL, DIHYDROPYRANYL, OR TETRAHYDROPYRANYL. ADDITIONAL CONVENTIONAL STABILIZERS SUCH AS NITRILES, ETHERS, ALCOHOLS, NITRATES, NITROALKANES AND ALIPHATIC EPOXIDES MAY ALSO BE INCLUDED IN THE STABILIZED METHYLCHLOROFORM COMPOSITION.
Inventors
- 👤 Alastair Campbell
- 👤 Peter Robinson
- 👤 James William Tipping
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:10
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/38; C07C17/42
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) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |