Patent US3898093A successfully refreshed from Google Patents.
Patent US2816140A successfully refreshed from Google Patents.
US2816140A
Expired / Lapsed
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Process for the production of oxalyl chloride
Assignee: EIDP Inc
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Filing: 1955-07-01
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Granted: 1957-12-10
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Expires: 1975-07-01
Abstract
No abstract record available.
Inventors
- 👤 Ellsworth K Ellingboe
- 👤 Melby Lester Russell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:22
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/58; C07C51/60
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
67 words
PROCESS FOR THE PREPARATION OF OXALYL CHLORIDE WHICH COMPRISES HEATING A TETRACHLOROETHYLENE GLYCOL ESTER, CONTAINING ONLY CARBON, OXYGEN, AND CHLORINE, OF A CARBOXYLIC ACID OF ONE TO TWO CARBONS AT A TEMPERATURE WITHIN THE RANGE 60*C-80*C. IN CONTACT WITH A CATALYST FREE FROM ACTIVE HYDROGEN AND OF THE CLASS CONSISTING OF ACTIVATED CHARCOAL OF VEGETABLE ORIGIN, TERTIARY AMINES, AMIDES OF SECONDARY AMINES, TERTIARY PHOSPHINES AND TERTIARY ARISINES.
References Cited (Backward Citations)
GB330511A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-12-09 | 1961-06-10 | 1961-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-09 | 1965-06-10 | 1965-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-09 | 1969-06-10 | 1969-12-10 | $7700.00 | Window Closed / Lapsed |