Patent US4265847A successfully refreshed from Google Patents.
Patent US3632531A successfully refreshed from Google Patents.
US3632531A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyurethane foams from aromatic polyisocyanate and methylol resin
Assignee: Midwest Research Institute
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Filing: 1967-08-25
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Granted: 1972-01-04
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Expires: 1987-08-25
Abstract
Abstract FOAMED POLYURETHANE RESINS WHICH ARE FIRE RETARDENT AND HEAT RESISTANT, PREPARED FROM AN AROMATIC POLYISOCYANATE AND A METHLOL RESIN WHICH IS THE REACTION PRODUCT OF A METHYLOL RESIN FORMER AND AN ALDEHYDE. THE FOAM IS PREFERABLY POST CURED. THE CHARACTER OF THE METHYLOL RESIN AND THE REACTION PARAMETERS FOR PREPARING THE METHYLOL RESIN AND THE FORM ARE SO CONTROLLED AS TO PROVIDE FIRE RETARDENT AND HEAT RESISTANT CHARACTERISTICS IN THE FOAMED PRODUCTS.
Inventors
- 👤 Donald J Rush
- 👤 Howard W Christie
- 👤 Thomas J Byerley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:24
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/54; C08G2110/00; C08G2110/0083
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) | 1975-01-03 | 1975-07-05 | 1976-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-03 | 1979-07-05 | 1980-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-03 | 1983-07-05 | 1984-01-04 | $7700.00 | Window Closed / Lapsed |