US2911380A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Poly-(aromatic ether) compositions and method of making same
Assignee: Dow Chemical Co
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Filing: 1955-08-26
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Granted: 1959-11-03
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Expires: 1975-08-26
Abstract
No abstract record available.
Inventors
- 👤 James D Doedens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:09
CPC Classifications
C; C08; C08G; C08G61/00; C08G61/12; C08G61/121; C08J; C08J9/00; C08J9/02
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
84 words
A SOLID FOAM BODY HAVING CELL WALLS COMPOSED ESSENTIALLY OF A SOLID CONDENSATION PRODUCT OF A REACTIVE AROMATIC STARTING MATERIAL COMPRISING A HALOMETHYLATED ORGANIC COMPOUND, SELECTED FROM THE CLASS CONSISTING OF HALOMETHYLATED DIPHENLOXIDE AND HALOM,ETHYLATED PHENYL BIPHGENYL ETHER, WHICH SOLID FOAM BODY IS PREPARED BY HEATING SAID STARTING MATERIAL AT REACTION TEMPERATURES BETWEEN 90* AND 400*C. THEREBY CAUSING A CONDENSATION REACTION INVOLVING AN INTERMOLECULAR SPLITTING OF A HYDROGEN HALIDE FROM THE STARTING MATERIAL WITH RESULTANT EXPANSION OF THE MASS INTO A FOAMED RESINOUS BODY.
References Cited (Backward Citations)
DE569570C
Cited
US2387037A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-11-02 | 1963-05-04 | 1963-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-11-02 | 1967-05-04 | 1967-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-11-02 | 1971-05-04 | 1971-11-03 | $7700.00 | Window Closed / Lapsed |