Patent US3210448A successfully refreshed from Google Patents.
US3210448A
Expired / Lapsed
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Method of molding a cellular polyurethane article having a porous surface
Assignee: Bayer Corp
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Filing: 1962-04-17
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Granted: 1965-10-05
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Expires: 1982-04-17
Abstract
No abstract record available.
Inventors
- 👤 John E Szabat
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:23
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/34; B; B29; B29C; B29C44/00; B29C44/02; B29C44/04; B29C33/00; B29C33/56; B29K; B29K2075/00; C08J2375/00; C08J2375/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
68 words
A METHOD OF MOLDING A POLYURETHANE FOAM HAVING A POROUS SURFACE WHICH COMPRISES PLACING A FOAMABLE POLYURETHANE REACTION MIXTURE IN A MOLD PROTECTED BY A MOLD RELEASE COMPRISING A FATTY ESTER OF POLYVINYL ALCOHOL AND A WAX, PERMITTING FOAMING TO FORM A SOLIDIFIED FOAM, HEATING THE MOLD, THEREBY MELTING THE MOLD RELEASE AND THEREAFTER REMOVING THE RESULTING MOLDED OBJECT FROM THE MOLD WHILE SAID MOLD RELEASE IS LIQUID.
Claim 2
Independent Claim
68 words
A METHOD OF MOLDING A POLYURETHANE FOAM HAVING A POROUS SURFACE WHICH COMPRISES PLACING A FOAMABLE POLYURETHANE REACTION MIXTURE IN A MOLD PROTECTED BY A MOLD RELEASE COMPRISING A FATTY ESTER OF POLYVINYL ALCOHOL AND A WAX, PERMITTING FOAMING TO FORM A SOLIDIFIED FOAM, HEATING THE MOLD, THEREBY MELTING THE MOLD RELEASE AND THEREAFTER REMOVING THE RESULTING MOLDED OBJECT FROM THE MOLD WHILE SAID MOLD RELEASE IS LIQUID.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-10-04 | 1969-04-05 | 1969-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-04 | 1973-04-05 | 1973-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-04 | 1977-04-05 | 1977-10-05 | $7700.00 | Window Closed / Lapsed |