Patent US2237863A successfully refreshed from Google Patents.
US2906643A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for forming composite cellular structures
Assignee: EIDP Inc
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Filing: 1957-01-22
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Granted: 1959-09-29
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Expires: 1977-01-22
Abstract
No abstract record available.
Inventors
- 👤 Dennis William Patterson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:14
CPC Classifications
C; C08; C08J; C08J9/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
104 words
A PROCESS FOR PRODUCING A COMPOSITE CELLULAR STRUCTURE WHICH COMPRISES (1) DISTRIBUTING OVER A SURFACE OF A PREFORMED HYDROPHILIC SPONGE STRUCTURE AN AGENT WHICH REACTS WITH FREE ISOCYANATE GROUPS OF FLUID POLYURETHANE FOAM-FORMING MIXTURES TO CAUSE ABRUPT CESSATION OF POLYMER CHAIN FORMATION, SAID AGENT BEING IN SUFFICIENT EXCESS TO REACT WITH MOST OF THE ISOCYANATE RADICAL IN ITS VICINITY: (2) DEPOSITING ON SAID SURFACE, HAVING DISTRIBUTED THEREON SAID AGENT, A FLUID FOAM-FORMING MIXTURE OF WATER AND A POLYURETHANE PRODUCT CONTAINIG A PLURALITY OF FREE ISOCYANATE GROUPS WHEREBY TO FORM IN SITU ON SAID SURFACE A PERMANENT POLYURETHANE FOAM; AND (3) THEREAFTER CURING SAID FOAM.
Claim 2
Dependent Claim
104 words
A PROCESS FOR PRODUCING A COMPOSITE CELLULAR STRUCTURE WHICH COMPRISES (1) DISTRIBUTING OVER A SURFACE OF A PREFORMED HYDROPHILIC SPONGE STRUCTURE AN AGENT WHICH REACTS WITH FREE ISOCYANATE GROUPS OF FLUID POLYURETHANE FOAM-FORMING MIXTURES TO CAUSE ABRUPT CESSATION OF POLYMER CHAIN FORMATION, SAID AGENT BEING IN SUFFICIENT EXCESS TO REACT WITH MOST OF THE ISOCYANATE RADICAL IN ITS VICINITY: (2) DEPOSITING ON SAID SURFACE, HAVING DISTRIBUTED THEREON SAID AGENT, A FLUID FOAM-FORMING MIXTURE OF WATER AND A POLYURETHANE PRODUCT CONTAINIG A PLURALITY OF FREE ISOCYANATE GROUPS WHEREBY TO FORM IN SITU ON SAID SURFACE A PERMANENT POLYURETHANE FOAM; AND (3) THEREAFTER CURING SAID FOAM.
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) | 1962-09-28 | 1963-03-30 | 1963-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-28 | 1967-03-30 | 1967-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-28 | 1971-03-30 | 1971-09-29 | $7700.00 | Window Closed / Lapsed |