US2833831A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of perfluorodienes
Assignee: Individual
•
Filing: 1955-07-14
•
Granted: 1958-05-06
•
Expires: 1975-07-14
Abstract
No abstract record available.
Inventors
- 👤 Haszeldine Robert Neville
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:25
CPC Classifications
C; C07; C07C; C07C57/00; C07C57/52; C07C17/00; C07C17/013; C07C17/04; C07C17/093; C07C17/23; C07C17/25; C07C17/26; C07C17/263; C07C17/269; C07C17/272; C07C17/278; C07C17/361
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
29 words
A PROCESS FOR THE PREPARTAION OF A PREFLUORODIENE WHICH COMPRISES SUBJECTTING TO PYROLYSIS, AT A PRESSURE BELOW ABOUT 300 MM. OF MERCURY ABSOLUTE, AN ANHYDROUS COMPOUND HAVING THE FORMULA
Claim 2
Dependent Claim
29 words
A PROCESS FOR THE PREPARTAION OF A PREFLUORODIENE WHICH COMPRISES SUBJECTTING TO PYROLYSIS, AT A PRESSURE BELOW ABOUT 300 MM. OF MERCURY ABSOLUTE, AN ANHYDROUS COMPOUND HAVING THE FORMULA
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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) | 1961-05-05 | 1961-11-04 | 1962-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-05 | 1965-11-04 | 1966-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-05 | 1969-11-04 | 1970-05-06 | $7700.00 | Window Closed / Lapsed |