US3929905A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chloromethyl 1,1-dimethyl-2-propynyl ether and process
Assignee: Wyeth Holdings LLC
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Filing: 1974-02-07
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Granted: 1975-12-30
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Expires: 1994-02-07
Abstract
Abstract The compound is chloromethyl 1,1-dimethyl-2-propynyl ether which is useful as an intermediate in the preparation of herbicidal compositions. The compound is prepared by reacting 2-methyl-3butyne-2-ol with para-formaldehyde and hydrogen chloride.
Inventors
- 👤 Barrington Cross
- 👤 Charles Paul Grasso
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:34
CPC Classifications
C; C07; C07C; C07C273/00; C07C273/18; C07C273/1854
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
4 words
CHLOROMETHYL 1, 1-DIMETHYL-2-PROPYNYL ETHER.
Claim 2
Dependent Claim
4 words
CHLOROMETHYL 1, 1-DIMETHYL-2-PROPYNYL ETHER.
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) | 1978-12-29 | 1979-06-30 | 1979-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-29 | 1983-06-30 | 1983-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-29 | 1987-06-30 | 1987-12-30 | $7700.00 | Window Closed / Lapsed |