Patent US2999888A successfully refreshed from Google Patents.
US2999888A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of chloroprene
Assignee: Distillers Co Yeast Ltd
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Filing: 1959-06-23
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Granted: 1961-09-12
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Expires: 1979-06-23
Abstract
No abstract record available.
Inventors
- 👤 Crocker Henry Peter
- 👤 Turck Karl Heinrich Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:48
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/25
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
65 words
THE PROCESS FOR THE PRODUCTION OF CHLOROPRENE WHICH COMPRISES TREATING 3:4-DICHLORBUTENE-1 WITH AN AQUEOUS ALKALI METAL HYDROXIDE SOLUTION AT A TEMPERATURE IN THE RANGE OF 70* TO 130*C., AND AT A PRESSURE SUFFICIENT TO MAINTAIN THE REACTION MIXTURE IN THE LIQUID PHASE, SEPARATING FROM THE REACTION MIXTURE AN OIL PHASE CONTAINING CHLOROPRENE AND UNREACTED DICHLORBUTENE AND DISTILLING THE OIL PHASE TO RECOVER THE CHLOROPRENE THEREFROM.
Claim 2
Dependent Claim
65 words
THE PROCESS FOR THE PRODUCTION OF CHLOROPRENE WHICH COMPRISES TREATING 3:4-DICHLORBUTENE-1 WITH AN AQUEOUS ALKALI METAL HYDROXIDE SOLUTION AT A TEMPERATURE IN THE RANGE OF 70* TO 130*C., AND AT A PRESSURE SUFFICIENT TO MAINTAIN THE REACTION MIXTURE IN THE LIQUID PHASE, SEPARATING FROM THE REACTION MIXTURE AN OIL PHASE CONTAINING CHLOROPRENE AND UNREACTED DICHLORBUTENE AND DISTILLING THE OIL PHASE TO RECOVER THE CHLOROPRENE THEREFROM.
References Cited (Backward Citations)
US2038538A
Cited
US2430016A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-09-11 | 1965-03-13 | 1965-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-09-11 | 1969-03-13 | 1969-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-09-11 | 1973-03-13 | 1973-09-12 | $7700.00 | Window Closed / Lapsed |