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Patent US2938884A successfully refreshed from Google Patents.
US2938884A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxypropylation of phenolic resins
Assignee: Dow Chemical Co
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Filing: 1956-11-20
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Granted: 1960-05-31
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Expires: 1976-11-20
Abstract
No abstract record available.
Inventors
- 👤 Diomed M Chern
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:00
CPC Classifications
C; C08; C08G; C08G8/00; C08G8/28; C08G8/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
50 words
IN A PROCESS FOR MAKING A 2-HYDROXYPROPHY ETHER OF A SOLUBLE PHENOL-ALDEHYDE MOVOLAC RESIN BY THE CONDENSATION OF PROPYLENE OXIDE WITH SAID RESIN, THE STEPS COMPRISING CONDUCTING THE CONDENSATION IN THE PRESENCE OF A CATALYTIC AMOUNT A TRIALKYLAMINE THE ALKYL GROUPS OF WHICH EACH CONTAINS 2 TO 5 CARBON ATOMS.
Claim 2
Dependent Claim
50 words
IN A PROCESS FOR MAKING A 2-HYDROXYPROPHY ETHER OF A SOLUBLE PHENOL-ALDEHYDE MOVOLAC RESIN BY THE CONDENSATION OF PROPYLENE OXIDE WITH SAID RESIN, THE STEPS COMPRISING CONDUCTING THE CONDENSATION IN THE PRESENCE OF A CATALYTIC AMOUNT A TRIALKYLAMINE THE ALKYL GROUPS OF WHICH EACH CONTAINS 2 TO 5 CARBON ATOMS.
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) | 1963-05-31 | 1963-11-30 | 1964-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-31 | 1967-11-30 | 1968-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-31 | 1971-11-30 | 1972-05-31 | $7700.00 | Window Closed / Lapsed |