Patent US3736293A successfully refreshed from Google Patents.
US3736293A
Expired / Lapsed
US
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Polyethers containing repeating perchloroaromatic units
Assignee: EIDP Inc
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Filing: 1971-08-23
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Granted: 1973-05-29
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Expires: 1991-08-23
Abstract
Abstract WHEREIN -A- AND -A''- ARE -O- OR -S-, -ARIS A DIVALENT PERCHLORINATED AROMATIC GROUP AND -AR''IS A DOIVALENT AROMATIC GROUP. THE PROCESS OF PRODUCING THE ABOVE POLYMERS BY REACTING A COMPOUND OF THE FORMULA CL-AR-CL WITH A COMPOUND OF THE FORMULA H-A-AR''-A''-H AT FROM 25 TO 250*C. IN THE LIQUID PHASE AND PREFERABLY IN A SOLVENT FOR ONE OR BOTH OF THE MONOMERS. $AR-A-AR''-A''$ NORMALLY SOLID POLYETHERS OF THE STRUCTURE
Inventors
- 👤 E Novak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:06
CPC Classifications
C; C08; C08G; C08G75/00; C08G75/12; C08G65/00; C08G65/34; C08G65/38; C08G65/40; C08G65/4006; C08G75/02; C08G75/0204; C08G75/0227; C08G75/04; C08G75/20; C08G2650/00; C08G2650/28; C08G2650/46; C08G2650/48
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) | 1976-05-28 | 1976-11-27 | 1977-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-28 | 1980-11-27 | 1981-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-28 | 1984-11-27 | 1985-05-29 | $7700.00 | Window Closed / Lapsed |