Patent US3256249A successfully refreshed from Google Patents.
US3256249A
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Phosphoramidate based polyurethanes
Assignee: Wyandotte Chemicals Corp
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Filing: 1963-11-21
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Granted: 1966-06-14
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Expires: 1983-11-21
Abstract
No abstract record available.
Inventors
- 👤 Herwart C Vogt
- 👤 Jr John T Patton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:35
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/547; C07F9/6564; C07F9/6571; C07F9/657154; C07F9/06; C07F9/22; C07F9/24; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/30; C08G18/38; C08G18/3878; C08G18/3889; C08G18/40; C08G18/48; C08G18/50; C08G18/5075; C08G18/509
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
26 words
A FIRE RETARDANT POLYURETHANE RESIN COMPRISING THE REACTION PRODUCT OF AN ORGANIC POLYISOCYANATE AND A PHOSPHORAMIDATE CONTAINING AT LEAST ONE HYDROXYL GROUP REPRESENTED BY THE FORMULA:
Claim 2
Dependent Claim
26 words
A FIRE RETARDANT POLYURETHANE RESIN COMPRISING THE REACTION PRODUCT OF AN ORGANIC POLYISOCYANATE AND A PHOSPHORAMIDATE CONTAINING AT LEAST ONE HYDROXYL GROUP REPRESENTED BY THE FORMULA:
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) | 1969-06-13 | 1969-12-13 | 1970-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-06-13 | 1973-12-13 | 1974-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-06-13 | 1977-12-13 | 1978-06-14 | $7700.00 | Window Closed / Lapsed |