US3405105A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization of tetrahydrofuran and derivatives thereof with organic sulfonic acids
Assignee: Phillips Petroleum Co
•
Filing: 1965-11-12
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Granted: 1968-10-08
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Expires: 1985-11-12
Abstract
No abstract record available.
Inventors
- 👤 Jennings P Blackwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:28
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/02; C08G65/04; C08G65/06; C08G65/16; C08G65/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2843568A
Cited
US3328362A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-10-08 | 1972-04-08 | 1972-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-08 | 1976-04-08 | 1976-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-08 | 1980-04-08 | 1980-10-08 | $7700.00 | Window Closed / Lapsed |