Patent US3235561A successfully refreshed from Google Patents.
US3235561A
Expired / Lapsed
US
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Method for preparing perfluoro-(n-methyl pyrrolidine)
Assignee: Pennwalt Corp
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Filing: 1963-03-05
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Granted: 1966-02-15
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Expires: 1983-03-05
Abstract
No abstract record available.
Inventors
- 👤 Robert N Haszeldine
- 👤 Ronald E Banks
- 👤 Cheng Wai Ming
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:37
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/02; H01B3/16; C; C07; C07D; C07D207/00; C07D207/02; C07D207/04; C07D207/10; C07D211/00; C07D211/04; C07D211/68; C07D211/72; C10; C10M; C10M1/00; C10M1/08; C10M2215/00; C10M2215/22; C10M2215/221; C10M2215/225; C10M2215/226; C10M2215/24; C10M2215/30; C10N; C10N2040/00; C10N2040/08; C10N2040/14; C10N2040/16; C10N2040/17
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
58 words
A METHOD FOR THE PREPARATION OF PERFLUORO(NMETHYLPYRROLIDINE) WHICH CONSISTS IN HEATING UNDECAFLUOROPIPERIDINE IN A REACTION VESSEL HAVING AN INERT INNER SURFACE TO A TEMPERATURE OF FROM 200*C. TO 900*C., AND UNDER A PRESSURE OF FROM ABOUT 500 MM. HG ABSOLUTE TO 10 ATMOSPHERES ABSOLUTE, IN THE PRESENCE OF AN INERT GAS, AND RECOVERING PERFLUORO(N-METHYLPRYOLIDINE) FROM THE REACTON PRODUCT.
Claim 2
Independent Claim
58 words
A METHOD FOR THE PREPARATION OF PERFLUORO(NMETHYLPYRROLIDINE) WHICH CONSISTS IN HEATING UNDECAFLUOROPIPERIDINE IN A REACTION VESSEL HAVING AN INERT INNER SURFACE TO A TEMPERATURE OF FROM 200*C. TO 900*C., AND UNDER A PRESSURE OF FROM ABOUT 500 MM. HG ABSOLUTE TO 10 ATMOSPHERES ABSOLUTE, IN THE PRESENCE OF AN INERT GAS, AND RECOVERING PERFLUORO(N-METHYLPRYOLIDINE) FROM THE REACTON PRODUCT.
References Cited (Backward Citations)
US2631151A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-02-14 | 1969-08-16 | 1970-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-14 | 1973-08-16 | 1974-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-14 | 1977-08-16 | 1978-02-15 | $7700.00 | Window Closed / Lapsed |