Patent US3879312A successfully refreshed from Google Patents.
US3879312A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and catalyst
Assignee: Shell USA Inc
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Filing: 1974-01-07
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Granted: 1975-04-22
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Expires: 1994-01-07
Abstract
Abstract The invention relates to a process for the preparation of polyether polyols by cationic polymerization of organic cyclic ethers using novel hydroxylammonium hexafluoroantimonate catalysts. It also relates to the novel hydroxylammonium hexafluoroantimonate catalysts and a process for producing same.
Inventors
- 👤 Anne C Udding
- 👤 Marie M Schlesser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:30
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/02; C08G65/04; C08G65/22; C07; C07F; C07F9/00; C07F9/90; C07F9/902; C08G65/06; C08G65/08; C08G65/10; C08G65/105
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
15 words
IN THE PROCESS OF ACID-CATALYZED POLYMERIZATION OF ORGANIC CYCLIC ETHERS USING REPRESENTED BY THE FORMULA
Claim 2
Dependent Claim
15 words
IN THE PROCESS OF ACID-CATALYZED POLYMERIZATION OF ORGANIC CYCLIC ETHERS USING REPRESENTED BY THE FORMULA
Claim 3
Dependent Claim
15 words
In the process of acid-catalyzed polymerization of organic cyclic ethers using represented by the formula
Claim 4
Dependent Claim
15 words
In the process of acid-catalyzed polymerization of organic cyclic ethers using represented by the formula
Claim 5
Dependent Claim
12 words
The process of claim 1 where R1 and R2 are benzyl groups.
References Cited (Backward Citations)
US3542828A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-21 | 1978-10-21 | 1979-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-21 | 1982-10-21 | 1983-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-21 | 1986-10-21 | 1987-04-22 | $7700.00 | Window Closed / Lapsed |