Patent US3759692A successfully refreshed from Google Patents.
Patent US2852572A successfully refreshed from Google Patents.
US2852572A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of trichloroethylene suitable for pharmaceutical use
Assignee: Airco Inc
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Filing: 1953-09-11
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Granted: 1958-09-16
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Expires: 1973-09-11
Abstract
No abstract record available.
Inventors
- 👤 Julius G Shukys
- 👤 Ashton M Lyon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:13
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/38
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
44 words
THE PROCESS FOR THE PURIFICATION OF CRUDE TRICHLOROETHYLENE CONTAINING AN AMINE, CHLORIDE ION AND ACETYLENIC COMPOUNDS AS IMPURITIES, COMPRISING PASSING SAID CRUDE TRICHLORETHYLENE THROUGH A BED OF ACTIVATED ALUMINA TO EFFECTIVELY REMOVE SAID IMPURITIES AND OBTAINING THE TREATED PRODUCT SUBSTANTIALLY FREE OF SUCH IMPURITIES.
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) | 1961-09-15 | 1962-03-17 | 1962-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-15 | 1966-03-17 | 1966-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-15 | 1970-03-17 | 1970-09-16 | $7700.00 | Window Closed / Lapsed |