US2617836A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of olefinic c4f8
Assignee: 3M Co
•
Filing: 1951-04-18
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Granted: 1952-11-11
•
Expires: 1971-04-18
Abstract
No abstract record available.
Inventors
- 👤 Wilbur H Pearlson
- 👤 Lyle J Hals
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:53
CPC Classifications
C; C07; C07C; C07C21/00; C07C21/02; C07C21/18; C07C17/00; C07C17/35; C07C17/358
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
45 words
A PROCESS WHICH COMPRISES PASSING A GASEOUS CHARGING STOCK PRIMARILY CONSISTING OF OCTAFLUOROCYCLOBUTANE THROUGH A HEATED TUBE MAINTAINED AT A TEMPERATURE OF THE ORDER OF 700* C. AND FOR A TIME SUFFICIENT TO CAUSE UPWARDS OF 50% CONVERSION TO OLEFINIC C4F8, AND RECOVERING THE LATTER.
Claim 2
Dependent Claim
45 words
A PROCESS WHICH COMPRISES PASSING A GASEOUS CHARGING STOCK PRIMARILY CONSISTING OF OCTAFLUOROCYCLOBUTANE THROUGH A HEATED TUBE MAINTAINED AT A TEMPERATURE OF THE ORDER OF 700* C. AND FOR A TIME SUFFICIENT TO CAUSE UPWARDS OF 50% CONVERSION TO OLEFINIC C4F8, AND RECOVERING THE LATTER.
Claim 3
Dependent Claim
5 words
THE NOVEL COMPOUND, PERFLUOROISOBUTENE, (CF)2C=CF2.
Claim 4
Dependent Claim
5 words
THE NOVEL COMPOUND, PERFLUOROISOBUTENE, (CF)2C=CF2.
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) | 1955-11-11 | 1956-05-12 | 1956-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-11-11 | 1960-05-12 | 1960-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-11-11 | 1964-05-12 | 1964-11-11 | $7700.00 | Window Closed / Lapsed |