US2777004A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of hexafluorobutadiene from symmetrical dichlorodifluoroethylene
Assignee: Dow Chemical Co
•
Filing: 1953-06-24
•
Granted: 1957-01-08
•
Expires: 1973-06-24
Abstract
No abstract record available.
Inventors
- 👤 Robert P Ruh
- 👤 Ralph A Davis
- 👤 Keith A Allswede
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:57
CPC Classifications
C; C07; C07C; C07C21/00; C07C21/02; C07C21/19
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
29 words
A PROCESS FOR THE PREPARATION OF HEXAFLUORO-1,3BUTADIENE WHICH COMPRISES FLUORINATING 1,1,2,3,4-HEXA-D CHLORO-1,2,3,4-TETRAFLUOROBUTANE TO 1,2,3,4-TETRACHLORO1,1,2,3,4-HEXAFLUOROBUTANE AND DECHLORINATING THIS LATTER COMPOUND WITH ZINC IN THE PRESENCE OF ALCOHOL TO OBTAIN HEXAFLUORO-1,3-BUTADIENE.
Claim 2
Dependent Claim
29 words
A PROCESS FOR THE PREPARATION OF HEXAFLUORO-1,3BUTADIENE WHICH COMPRISES FLUORINATING 1,1,2,3,4-HEXA-D CHLORO-1,2,3,4-TETRAFLUOROBUTANE TO 1,2,3,4-TETRACHLORO1,1,2,3,4-HEXAFLUOROBUTANE AND DECHLORINATING THIS LATTER COMPOUND WITH ZINC IN THE PRESENCE OF ALCOHOL TO OBTAIN HEXAFLUORO-1,3-BUTADIENE.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-01-08 | 1960-07-09 | 1961-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-08 | 1964-07-09 | 1965-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-08 | 1968-07-09 | 1969-01-08 | $7700.00 | Window Closed / Lapsed |