US2537706A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of polyvinyl ethers
Assignee: Shawinigan Resins Corp
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Filing: 1948-08-17
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Granted: 1951-01-09
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Expires: 1968-08-17
Abstract
No abstract record available.
Inventors
- 👤 Rudoff Hyman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:37
CPC Classifications
C; C08; C08F; C08F8/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
58 words
A PROCESS FOR PREPARING POLYVINYL ETHERS WHICH COMPRISES REACTING A POLYMER OF A VINYL ESTER OF AN ORGANIC ACID WITH AN ETHERIFYING AGENT FROM THE GROUP CONSISTING OF DIMETHYL SULFATE AND DIETHYL SULFATE IN THE PRESENCE OF AN AQUEOUS SOLUTION OF AN ALKALI METAL HYDROXIDE AND A WATER-MISCIBLE SOLVENT FOR BOTH THE POLYVINYL ESTER AND THE POLYVINYL ETHER.
Claim 2
Dependent Claim
58 words
A PROCESS FOR PREPARING POLYVINYL ETHERS WHICH COMPRISES REACTING A POLYMER OF A VINYL ESTER OF AN ORGANIC ACID WITH AN ETHERIFYING AGENT FROM THE GROUP CONSISTING OF DIMETHYL SULFATE AND DIETHYL SULFATE IN THE PRESENCE OF AN AQUEOUS SOLUTION OF AN ALKALI METAL HYDROXIDE AND A WATER-MISCIBLE SOLVENT FOR BOTH THE POLYVINYL ESTER AND THE POLYVINYL ETHER.
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) | 1954-01-08 | 1954-07-10 | 1955-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-08 | 1958-07-10 | 1959-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-08 | 1962-07-10 | 1963-01-09 | $7700.00 | Window Closed / Lapsed |