Patent US3830760A successfully refreshed from Google Patents.
US3830760A
Expired / Lapsed
US
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Urethane foams cured by atmospheric moisture
Assignee: Imperial Chemical Industries Ltd
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Filing: 1970-09-11
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Granted: 1974-08-20
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Expires: 1990-09-11
Abstract
Abstract PROCESS FOR PREPARING A FOAMABLE COMPOSITION BY FORMING AMIXTTURE OF A POLYMER OF POLYMER PRECURSOR, CURABLE ON CONTACT WITH THE ATMOSPHERE, AND A POLYMER-SOLUBLE INERT BLOWING AGENT UNDER SUCH A PRESSURE THAT THE BLOWING AGENT IS SUBSTANTIALLY IN CONDENSED FORM, THE MIXTURE BEING CAPABLE, UPON RELEASE OF THE PRESSURE, OF EXPANDING DUE TO VAPORISATION OF THE BLOWING AGENT TO FORM A FOAM WHICH THEN CURVES WITHOUT SUBSTANTIAL CHANGE IN VOLUME.
Inventors
- 👤 O Bengtson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:24
CPC Classifications
B; B29; B29C; B29C44/00; C; C08; C08J; C08J9/00; C08J9/04; C08J9/12; C08J9/14; C08J9/143; C08J9/147; B29K; B29K2105/00; B29K2105/04
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) | 1977-08-19 | 1978-02-18 | 1978-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-19 | 1982-02-18 | 1982-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-19 | 1986-02-18 | 1986-08-20 | $7700.00 | Window Closed / Lapsed |