US2647110A
Expired / Lapsed
US
⏱️ 0.0 years remaining
2, 3-difluorobutadiene preparation and polymers thereof
Assignee: Bridgestone Firestone Inc
•
Filing: 1949-01-06
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Granted: 1953-07-28
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Expires: 1969-01-06
Abstract
No abstract record available.
Inventors
- 👤 Park A Wiseman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:45
CPC Classifications
C; C07; C07C; C07C21/00; C07C21/02; C07C21/19; C07C21/20; C07C17/00; C07C17/013; C07C17/04; C07C17/093; C07C17/20; C07C17/202; C07C17/206; C07C17/23; C08; C08F; C08F36/00; C08F36/02; C08F36/04; C08F36/14; C08F36/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
8 words
PROCESS WHICH COMPRISES DEHALOGENATING 1,2,3,4-TETRACHLORO-2,3-DIFLUORO-BUTANE TO YIELD 2,3-DIFLUORO-1,3-BUTADIENE.
Claim 2
Dependent Claim
8 words
PROCESS WHICH COMPRISES DEHALOGENATING 1,2,3,4-TETRACHLORO-2,3-DIFLUORO-BUTANE TO YIELD 2,3-DIFLUORO-1,3-BUTADIENE.
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) | 1956-07-27 | 1957-01-26 | 1957-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-27 | 1961-01-26 | 1961-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-27 | 1965-01-26 | 1965-07-28 | $7700.00 | Window Closed / Lapsed |