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Patent US3299151A successfully refreshed from Google Patents.
US3299151A
Expired / Lapsed
US
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Preparation of polyether polyols
Assignee: PPG Industries Inc
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Filing: 1963-10-08
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Granted: 1967-01-17
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Expires: 1983-10-08
Abstract
No abstract record available.
Inventors
- 👤 Wismer Marco
- 👤 Herman P Doerge
- 👤 John R Peffer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:31
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G65/00; C08G65/02; C08G65/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
44 words
A PROCESS FOR PURIFYING A CRUDE LOWER ALKYLENE OXIDE-POLYETHER POLYOL CONTAINING AN ALKALI METAL HYDROXIDE CATALYST, WHICH COMPRISES ADDING FORMIC ACID TO SAID POLYETHER POLYOL IN SUFFICIENT QUANTITY TO PRECIPITATE SUBSTANTIALLY ALL OF SAID CATALYST IN THE CRUDE POLYETHER POLYOL, AND REMOVING SAID PRECIPITATE.
Claim 2
Dependent Claim
44 words
A PROCESS FOR PURIFYING A CRUDE LOWER ALKYLENE OXIDE-POLYETHER POLYOL CONTAINING AN ALKALI METAL HYDROXIDE CATALYST, WHICH COMPRISES ADDING FORMIC ACID TO SAID POLYETHER POLYOL IN SUFFICIENT QUANTITY TO PRECIPITATE SUBSTANTIALLY ALL OF SAID CATALYST IN THE CRUDE POLYETHER POLYOL, AND REMOVING SAID PRECIPITATE.
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) | 1970-01-16 | 1970-07-18 | 1971-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-16 | 1974-07-18 | 1975-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-16 | 1978-07-18 | 1979-01-17 | $7700.00 | Window Closed / Lapsed |