US3799896A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyisocyanurate
Assignee: Celotex Corp
•
Filing: 1972-05-08
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Granted: 1974-03-26
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Expires: 1992-05-08
Abstract
Abstract AN IMPROVED POLYISOCYANURATE COMPRISING POLYMETHYLENE POLYPHENYLISOCYANATE HAVING A FUNCITIONALITY OF 2.1 TO 3.2 AND HAVING AN EQUIVALENT WEIGHT BETWEEN 120 AND 180; A POLYOL HAVING AN EQUIVALENT WEIGHT BETWEEN 30 AND 100; A TERTIARY AMINE; AN N-SUBSTITUTED AZIRIDINE; AN ORGANIC EPOXIDE, AND A BLOWING AGENT. THESE COMPOSITIONS EXHIBIT AND ADVANTAGEOUS CREAM TIME AND FIRM TIME AND A REDUCED FRIABILITY.
Inventors
- 👤 E Moss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:50
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/16; C08G18/161; C08G18/003; C08G18/09; C08G18/092; C08G18/70; C08G18/72; C08G18/74; C08G18/76; C08G18/7657; C08G18/7664
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) | 1977-03-25 | 1977-09-24 | 1978-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-25 | 1981-09-24 | 1982-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-25 | 1985-09-24 | 1986-03-26 | $7700.00 | Window Closed / Lapsed |