Patent US3053904A successfully refreshed from Google Patents.
US3053904A
Expired / Lapsed
US
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Bisphenol preparation
Assignee: Shell USA Inc
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Filing: 1960-05-25
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Granted: 1962-09-11
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Expires: 1980-05-25
Abstract
No abstract record available.
Inventors
- 👤 Albert L Rocklin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:47
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/50; C10; C10M; C10M2207/00; C10M2207/02; C10M2207/023; C10M2207/024; C10M2207/026; C10M2207/04; C10M2207/046; C10N; C10N2050/00; C10N2050/10
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
34 words
THE PROCESS FOR PREPARING BIS!HYDROXYPHENY) METHANE, EACH HYDROXYPHENYL GROUP HAVING UP TO 4 ALKYL SUBSTITUENTS AND EACH ALKYL SUBSTITUENT HAVING UP TO 8 CARBON ATOMS WHICH COMPRISES REACTION THE BIS(HYDROXYPHENYL) POLYETHER HAVING THE STRUCTURE
References Cited (Backward Citations)
US2841622A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-09-10 | 1966-03-12 | 1966-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-09-10 | 1970-03-12 | 1970-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-09-10 | 1974-03-12 | 1974-09-11 | $7700.00 | Window Closed / Lapsed |