Patent US5246438A successfully refreshed from Google Patents.
US3650993A
Expired / Lapsed
US
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Crush-before-final curing process for making densified polyurethane foam utilizing a volatile organic foaming agent
Assignee: ER Carpenter Co
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Filing: 1970-04-06
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Granted: 1972-03-21
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Expires: 1990-04-06
Abstract
Abstract AN IMPROVED PROCES FOR PREPARING FLEXIBLE, DENSIFIED POLYURETHANE FOAM IS DISCLOSED WHICH COMPRISES ALLOWING A POLYURETHANE FOAM FORMING REACTION MIXTURE CONTAINING AN ORGANIC FOAMING AGENT TO RISE, THEREBY FORMING A PARTIALLY CURED CELLULAR MATERIAL, AND APPLYING A COMPRESSIVE FORCE TO THE PARTIALLY CURED CELLULAR MATERIAL TO PERMANENTLY REDUCE ITS VOLUME. THE ORGANIC FOAMING AGENT INHIBITS THE FORMATIONOF OUTER LAYERS OF UNDENSIFIED POLYURETHANE FOAM INTEGRAL WITH THE DENSIFIED POLYURETHANE FOAM. THE RESULTING FLEXIBLE, DENSIFIED POLYURETHANE FOAM IS PARTICULARLY USEFUL FOR SUCH APPLICATIONS AS CUSHIONING AND RUG PADDING.
Inventors
- 👤 Natale C Zocco
- 👤 Stanley I Cohen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:03
CPC Classifications
C; C08; C08J; C08J9/00; C08J2375/00; C08J2375/04; Y; Y10; Y10S; Y10S264/00; Y10S264/13; Y10S264/14; Y10S521/00; Y10S521/918
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) | 1975-03-21 | 1975-09-20 | 1976-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-21 | 1979-09-20 | 1980-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-21 | 1983-09-20 | 1984-03-21 | $7700.00 | Window Closed / Lapsed |