US3607797A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite cellular material
Assignee: Dow Chemical Co
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Filing: 1969-02-20
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Granted: 1971-09-21
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Expires: 1989-02-20
Abstract
Abstract The disclosure concerns composite cellular material comprising foamed styrene polymer bodies dispersed in a polyurethane foam matrix and a method of making the cellular material.
Inventors
- 👤 Louis C Rubens
- 👤 Donald H Clarke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:32
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/35; C08J2205/00; C08J2205/04; C08J2205/05; C08J2375/00; C08J2375/04; C08J2425/00
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
19 words
A composite foam as claimed in Claim 1 wherein the foamed copolymer is a cOpolymer of styrene and divinylbenezene.
Claim 2
Dependent Claim
52 words
A composite foam as claimed in claim 1 wherein the polyether polyol urethane foam matrix is made from a polyol that is an adduct of an alkylene oxide or mixtures thereof and a polyhydric alcohol having from 3 to 5 carbon atoms and from 3 to 4 OH groups in the molecule.
Claim 3
Dependent Claim
14 words
A composite foam as claimed in Claim 1 wherein the polyisocyanate is tolylene diisocyanate.
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) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |