Patent US2432997A successfully refreshed from Google Patents.
US2432997A
Expired / Lapsed
US
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Perfluorocyclohexadiene
Assignee: Purdue Research Foundation
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Filing: 1945-11-13
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Granted: 1947-12-23
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Expires: 1965-11-13
Abstract
No abstract record available.
Inventors
- 👤 Waldo B Ligett
- 👤 Earl T Mcbee
- 👤 Vincent V Lindgren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:06
CPC Classifications
C; C07; C07C; C07C23/00; C07C23/02; C07C23/10; C07C17/00; C07C17/013; C07C17/02
Claims Analysis
Total Claims: 0
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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) | 1950-12-22 | 1951-06-23 | 1951-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-12-22 | 1955-06-23 | 1955-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-12-22 | 1959-06-23 | 1959-12-23 | $7700.00 | Window Closed / Lapsed |