US3574770A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydroxy terminated perfluoro ethers
Assignee: National Aeronautics and Space Administration
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Filing: 1968-10-24
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Granted: 1971-04-13
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Expires: 1988-10-24
Abstract
Abstract HYDROXY TERMINATED PERFLUORO ETHERS AND POLYURETHANE RESINS INCORPORATING THE STRUCTURE -CH2CF(CF3)(OCF2CF(CF3))MO(CF2)PO (CF(CF3)CF2O)NCF(CF3)CH2- WHERE P IS AN INTEGER OF 2 TO 12, AND M AND N ARE INTEGERS WHOSE SUM IS FROM 0 TO 20.
Inventors
- 👤 Eugene C Stump Jr
- 👤 Stephen Eugene Rochow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:48
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/02; C08G65/32; C08G65/321; C07; C07C; C07C43/00; C07C43/02; C07C43/03; C07C43/04; C07C43/13; C07C43/137; C08G18/00; C08G18/06; C08G18/28; C08G18/30; C08G18/38; C08G18/3802; C08G18/3804; C08G18/3812; C08G18/40; C08G18/48; C08G18/50; C08G18/5003; C08G18/5015
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) | 1974-04-12 | 1974-10-12 | 1975-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-12 | 1978-10-12 | 1979-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-12 | 1982-10-12 | 1983-04-13 | $7700.00 | Window Closed / Lapsed |