US3329664A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Esterification process
Assignee: National Institute of Advanced Industrial Science and Technology
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Filing: 1962-08-13
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Granted: 1967-07-04
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Expires: 1982-08-13
Abstract
No abstract record available.
Inventors
- 👤 Tsuda Minoru
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:23
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/14; C08F2810/00; C08F2810/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
59 words
A PROCESS FOR ESTERIFYING POLYHYDROXY-CONTAINING ORGANIC POLYMERS COMPRISING REACTING AN ACYL HALIDE WITH SAID POLYMER, AT A LOW TEMPERATURE, IN A REACTION SYSTEM COMPRISING (I) A HYDROPHOBIC SOLVENT, (II) A HYDROPHILIC ORGANIC SOLVENT, ANAD (III) AN ALKALINE AQUEOUS SOLUTION CONTAINING AT LEAST ONE INORGANIC ALKALINE MATERIAL SELECTED FROM THE GROUP CONSISTING OF ALKALI METAL AND ALKALINE EARTH METAL HYDROXIDES.
Claim 2
Dependent Claim
59 words
A PROCESS FOR ESTERIFYING POLYHYDROXY-CONTAINING ORGANIC POLYMERS COMPRISING REACTING AN ACYL HALIDE WITH SAID POLYMER, AT A LOW TEMPERATURE, IN A REACTION SYSTEM COMPRISING (I) A HYDROPHOBIC SOLVENT, (II) A HYDROPHILIC ORGANIC SOLVENT, ANAD (III) AN ALKALINE AQUEOUS SOLUTION CONTAINING AT LEAST ONE INORGANIC ALKALINE MATERIAL SELECTED FROM THE GROUP CONSISTING OF ALKALI METAL AND ALKALINE EARTH METAL HYDROXIDES.
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) | 1970-07-03 | 1971-01-02 | 1971-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-03 | 1975-01-02 | 1975-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-03 | 1979-01-02 | 1979-07-04 | $7700.00 | Window Closed / Lapsed |