US3829522A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synthesis of alkynes by dehydrohalogenation
Assignee: PMC Inc
•
Filing: 1971-10-21
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Granted: 1974-08-13
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Expires: 1991-10-21
Abstract
Abstract MIXTURE AS A CONDENSED LIQUID. THE ALKYNE PRODUCTS ARE OBTAINED IN HIGH YEILD. A PROCESS FOR PREPARING ALKYNES OF HIGH PURITY BY DEHYDROGENATION. HALOGENATED PRECURSORS CONSISTING OF DIHALOALKANES AND MONOHALOALKENES ARE REACTED WITH PARTIAL ALCOHOLATE OF AN ALKALI METAL AND AN ALIPHATIC POLYOL. THE REACTION MIXTURE REMAINS FLUID DURING THE PROCESS. ALKYNES AND VOLATILE BY-PRODUCTS ARE EVAPORATED FROM THE REACTION MIXTURE AND PARTIALLY CONDENSED IN A SEPARATION TO RECOVER THE HIGH-PURITY ALKYNE PRODUCT. THE VOLATILE BY-PRODUCTS ARE RETURNED TO THE REACTION
Inventors
- 👤 C Schneider
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:55
CPC Classifications
C; C07; C07C; C07C11/00; C07C11/22; C07C1/00; C07C1/26; C07C1/30; Y; Y10; Y10S; Y10S585/00; Y10S585/8995; Y10S585/905
Claims Analysis
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References Cited (Backward Citations)
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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) | 1977-08-12 | 1978-02-11 | 1978-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-12 | 1982-02-11 | 1982-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-12 | 1986-02-11 | 1986-08-13 | $7700.00 | Window Closed / Lapsed |