Patent US2538723A successfully refreshed from Google Patents.
US2538723A
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Process for producing perchlorethylene
Assignee: Donau Chemie AG
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Filing: 1947-07-28
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Granted: 1951-01-16
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Expires: 1967-07-28
Abstract
No abstract record available.
Inventors
- 👤 Fruhwirth Otto
- 👤 Walla Heinrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:17
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/013; C07C17/02; C07C17/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
66 words
A PROCESS OF PRODUCING PERCHLORETHYLENE WHICH COMPRISES BURNING AN INTIMATE MIXTURE OF ACETYLENE AND CHLORINE IN THE PROPORTION BY VOLUME OF ABOUT 1:3 TO 1:3.5, IN THE FORM OF A FLAME IN WHICH FLAME THE TEMPERATURE AT THE COOLER END IS ABOUT 600* C., AND THE TEMPERATURE AT THE HOTTEST PART OF THE FLAME, I.E. AT ITS END, IS ABOUT 750* C. TO ABOUT 950* C.
Claim 2
Dependent Claim
66 words
A PROCESS OF PRODUCING PERCHLORETHYLENE WHICH COMPRISES BURNING AN INTIMATE MIXTURE OF ACETYLENE AND CHLORINE IN THE PROPORTION BY VOLUME OF ABOUT 1:3 TO 1:3.5, IN THE FORM OF A FLAME IN WHICH FLAME THE TEMPERATURE AT THE COOLER END IS ABOUT 600* C., AND THE TEMPERATURE AT THE HOTTEST PART OF THE FLAME, I.E. AT ITS END, IS ABOUT 750* C. TO ABOUT 950* C.
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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) | 1954-01-15 | 1954-07-17 | 1955-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-15 | 1958-07-17 | 1959-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-15 | 1962-07-17 | 1963-01-16 | $7700.00 | Window Closed / Lapsed |