US3705880A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of alkylene oxide copolymers
Assignee: Japanese Geon Co Ltd
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Filing: 1970-12-23
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Granted: 1972-12-12
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Expires: 1990-12-23
Abstract
Abstract A PROCESS FOR THE PREPARATION OF ALKYLENE OXIDE-ISOCYANATE COPOLYMERS, WHICH COMPRISES POLYMERIZING AN ALKYLENE OXIDE IN THE PRESENCE OF AT LEAST ONE ISOCYANATE COMPOUND, WITH THE ACTION OF A CATALYST FORMED OF A LEAST ONE COMPOUND CONTAINING A PHOSPHORUS-OXYGEN LINKAGE AND AT LEAST ONE COMPOUND OF A METAL OF GROUP III AND IV OF THE PERIODIC TABLE.
Inventors
- 👤 Toshiaki Matsuo
- 👤 Koji Chono
- 👤 Tadahiro Go
- 👤 Hirotaka Komai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:38
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/003; Y; Y10; Y10S; Y10S528/00; Y10S528/906
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) | 1975-12-12 | 1976-06-12 | 1976-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-12 | 1980-06-12 | 1980-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-12 | 1984-06-12 | 1984-12-12 | $7700.00 | Window Closed / Lapsed |