Patent US1671220A successfully refreshed from Google Patents.
Patent US3804931A successfully refreshed from Google Patents.
US3804931A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of thin polyurethane foams and laminates
Assignee: Dow Chemical Co
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Filing: 1972-06-05
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Granted: 1974-04-16
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Expires: 1992-06-05
Abstract
Abstract POLYURETHANE FOAMS AND FOAM LAMINATES ARE RAPIDLY PREPARED BY APPLYING A REACTION MIXTURE COMPRISING A POLYOL AND A POLYISOCYANATE TO THE INTERFACE FORMED BY A PAIR OF SUBSTRATES AS THEY PASS BETWEEN A PAIR OF ROLLS, ADJUSTING THE PRESSURE BETWEEN SAID ROLLS SUCH THAT A FILLET OF SAID REACTION MIXTURE IS FORMED AND THEREAFTER PASSING THE SUBSTRATES CONTAINING A FOAMING MASS THEREBETWEEN THROUGH A SIZING DEVICE.
Inventors
- 👤 G Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:43
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/20; B29C44/30; B29C44/32; B29C44/328; B29L; B29L2007/00; B29L2009/00
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) | 1977-04-15 | 1977-10-15 | 1978-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-15 | 1981-10-15 | 1982-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-15 | 1985-10-15 | 1986-04-16 | $7700.00 | Window Closed / Lapsed |