Patent US2902471A successfully refreshed from Google Patents.
US2902471A
Expired / Lapsed
US
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Epoxy ethers, their polymers and derivatives
Assignee: Shell Development Co
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Filing: 1957-05-13
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Granted: 1959-09-01
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Expires: 1977-05-13
Abstract
No abstract record available.
Inventors
- 👤 Bruin Pieter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:39
CPC Classifications
C; C07; C07D; C07D407/00; C07D407/02; C07D407/12; C08; C08G; C08G59/00; C08G59/02; C08G59/04; C08G59/06; C08G59/063
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
16 words
POLYETHERS OF 1,2-EPOXY-SUBSTITUTED MONOHYDRIC ALCOHOLS AND POLY(LOWER ALKYL) POLYDROXY-PHENYLCHROMANS POSSESSING AT LEAST THREE PHENOLIC OH GROUPS.
Claim 2
Dependent Claim
16 words
POLYETHERS OF 1,2-EPOXY-SUBSTITUTED MONOHYDRIC ALCOHOLS AND POLY(LOWER ALKYL) POLYDROXY-PHENYLCHROMANS POSSESSING AT LEAST THREE PHENOLIC OH GROUPS.
References Cited (Backward Citations)
US2418459A
Cited
US2668807A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-31 | 1963-03-02 | 1963-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-31 | 1967-03-02 | 1967-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-31 | 1971-03-02 | 1971-09-01 | $7700.00 | Window Closed / Lapsed |