Patent US3256218A successfully refreshed from Google Patents.
US3256218A
Expired / Lapsed
US
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Dispersing coarse fillers in polyurethane foams
Assignee: EIDP Inc
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Filing: 1962-11-19
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Granted: 1966-06-14
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Expires: 1982-11-19
Abstract
No abstract record available.
Inventors
- 👤 Roger E Knox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:05
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/35; B; B29; B29B; B29B7/00; B29B7/80; B29B7/88; B29B7/90; B29C; B29C43/00; B29C43/32; B29C43/44; B29C43/48; B29C44/00; B29C44/20; B29C44/32; B29C44/329; B29C44/332; B29C44/34; B29C44/3442; B29C44/3469; B29C44/348; C08J9/0061; B29C2043/483; C08J2375/00; C08J2375/04; C08J2401/00; C08J2425/00; C08J2475/00; C08J2497/00; Y; Y10; Y10S; Y10S264/00; Y10S264/17
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
80 words
IN A PROCESS FOR PREPARING A CURED CELLULAR POLYURETHANE MATERIAL CONTAINING COARSE FILLER OF AT LEAST ABOUT 1/8 INCH EFFECTIVE DIAMETER WHEREIN A MIXTURE OF A SELFCURABLE POLYURETHANE FOAM PRECURSOR IS MIXED WITH AN INERT FLUID EXPANDING AGENT MAINTAINED UNDER SUPER-ATMOSPHERIC PRESSURE WHICH MIXTURE UPON PRESSURE REDUCTION FORMS A FROTH, THE IMPROVEMENT WHEREIN UNIFORM DISPERSION OF SAID COARSE FILLER IS OBTAINED WHICH CONSISTS IN CONTACTING AN INTIMATELY DISPERSING SAID FILLER WITH SAID PRECURSOR PROMPTLY AFTER SAID FROTH HAS BEEN FORMED
Claim 2
Dependent Claim
80 words
IN A PROCESS FOR PREPARING A CURED CELLULAR POLYURETHANE MATERIAL CONTAINING COARSE FILLER OF AT LEAST ABOUT 1/8 INCH EFFECTIVE DIAMETER WHEREIN A MIXTURE OF A SELFCURABLE POLYURETHANE FOAM PRECURSOR IS MIXED WITH AN INERT FLUID EXPANDING AGENT MAINTAINED UNDER SUPER-ATMOSPHERIC PRESSURE WHICH MIXTURE UPON PRESSURE REDUCTION FORMS A FROTH, THE IMPROVEMENT WHEREIN UNIFORM DISPERSION OF SAID COARSE FILLER IS OBTAINED WHICH CONSISTS IN CONTACTING AN INTIMATELY DISPERSING SAID FILLER WITH SAID PRECURSOR PROMPTLY AFTER SAID FROTH HAS BEEN FORMED
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-06-13 | 1969-12-13 | 1970-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-06-13 | 1973-12-13 | 1974-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-06-13 | 1977-12-13 | 1978-06-14 | $7700.00 | Window Closed / Lapsed |