Patent US3306872A successfully refreshed from Google Patents.
US3306872A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing a polyether resin
Assignee: Shell USA Inc
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Filing: 1961-10-16
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Granted: 1967-02-28
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Expires: 1981-10-16
Abstract
No abstract record available.
Inventors
- 👤 Russel L Maycock
- 👤 Alton J Landua
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 04:53
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/62; C08G59/621
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
83 words
A METHOD FOR PRODUCING A POLYETHER RESIN CHARACTERIZED BY HIGH IMPACT RESISTANCE WHEN IN MOLDED FORM, WHICH COMPRISES PREPARING A SOLUTION IN AN INERT SOLVENT DEFINED BELOW, OF (A) A DIHYDRIC PHENOL HAVING ITS PHENOLIC HYDROXYL GROUPS IN OTHER THAN ORTHO POSITION ON A SINGLE RING, SAID PHENOLIC HYDROXYL GROUPS BEING THE SOLE GROUPS THEREOF REACTIVE WITH A VIC-EPOXY GROUP, (B) A DIEPOXIDE SELECTED FROM THE GROUP CONSISTING OF (I) TERMINAL-DI-VIC-EPOXYALKANES (II) TERMINAL ALIPHATIC DI-VIC-EPOXY ETHERS (III) DIGLYCIDYL ETHERS HAVING THE GENERAL FORMULA
Claim 2
Independent Claim
83 words
A METHOD FOR PRODUCING A POLYETHER RESIN CHARACTERIZED BY HIGH IMPACT RESISTANCE WHEN IN MOLDED FORM, WHICH COMPRISES PREPARING A SOLUTION IN AN INERT SOLVENT DEFINED BELOW, OF (A) A DIHYDRIC PHENOL HAVING ITS PHENOLIC HYDROXYL GROUPS IN OTHER THAN ORTHO POSITION ON A SINGLE RING, SAID PHENOLIC HYDROXYL GROUPS BEING THE SOLE GROUPS THEREOF REACTIVE WITH A VIC-EPOXY GROUP, (B) A DIEPOXIDE SELECTED FROM THE GROUP CONSISTING OF (I) TERMINAL-DI-VIC-EPOXYALKANES (II) TERMINAL ALIPHATIC DI-VIC-EPOXY ETHERS (III) DIGLYCIDYL ETHERS HAVING THE GENERAL FORMULA
References Cited (Backward Citations)
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Cited
US2615008A
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US2602075A
Cited
US2921049A
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US2933472A
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US2943096A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-02-27 | 1970-08-29 | 1971-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-27 | 1974-08-29 | 1975-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-27 | 1978-08-29 | 1979-02-28 | $7700.00 | Window Closed / Lapsed |