Patent US3061497A successfully refreshed from Google Patents.
US3061497A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reinforced polyurethane plastics
Assignee: Zeneca Inc
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Filing: 1959-11-13
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Granted: 1962-10-30
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Expires: 1979-11-13
Abstract
No abstract record available.
Inventors
- 👤 Joseph E Wilson
- 👤 Cear Stanley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:36
CPC Classifications
B; B29; B29C; B29C70/00; B29C70/04; B29C70/06; B29C70/10; B29C70/12
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
81 words
A PROCESS FOR PREPARING A PLASTIC LAMINATE WHICH COMPRISES PREPARING A SYRYPY CONDENSATION PRODUCT OF A STOICHIOMETRIC EXCESS OF AN ARYLENEE DISSOCYANATE AND A POLYOXYPROPYLENE SORBITOL ETHER CONTAINING FROM ABOUT 8 TO ABOUT 30 OXYPROPYLENE GROUPS PER MOL, IMPREGNATING, AT ROOM TEMPERATURE, A PLURALITY OF LAYERS OF A FIBROUS REINFORCING MATERIAL WITH MIXTURE OF SAID CONDENSATION PRODUCT AND SUFFICIENT OF THE SAID POLYOXYPROPYLENE ETHER TO BRING THE NCO/OH RATIO TO SUBSTANTIALLY ONE, AND CURING THE ASSEMBLY AT ELEVATED TEMPERATURE AND PRESSURE.
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) | 1965-10-29 | 1966-04-30 | 1966-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-10-29 | 1970-04-30 | 1970-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-10-29 | 1974-04-30 | 1974-10-30 | $7700.00 | Window Closed / Lapsed |