US3033843A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of polyvinyl alcohol
Assignee: EIDP Inc
•
Filing: 1958-01-06
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Granted: 1962-05-08
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Expires: 1978-01-06
Abstract
No abstract record available.
Inventors
- 👤 Harold K Inskip
- 👤 Elbert V Kring
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:29
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/12; Y; Y10; Y10S; Y10S8/00; Y10S8/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
41 words
THE PROCESS FOR THE PREPARATION OF POLYVINYL ALCOHOL WHICH COMPRISES ALCOHOLIZING, WITH AN ALKALINE CATALYST, A POLYVINYL ESTER IN ADMIXTURE WITH A COMPOUND SELECTED FROM THE GROUP CONSISTING OF FORMALDEHYDE, HEMIACETALS OF FORMALDEHYDE, POLYOXYMETHYLENE GLYCOLS, AND BISULFITE ADDITION COMPOUNDS OF FORMALDEHYDE.
Claim 2
Dependent Claim
41 words
THE PROCESS FOR THE PREPARATION OF POLYVINYL ALCOHOL WHICH COMPRISES ALCOHOLIZING, WITH AN ALKALINE CATALYST, A POLYVINYL ESTER IN ADMIXTURE WITH A COMPOUND SELECTED FROM THE GROUP CONSISTING OF FORMALDEHYDE, HEMIACETALS OF FORMALDEHYDE, POLYOXYMETHYLENE GLYCOLS, AND BISULFITE ADDITION COMPOUNDS OF FORMALDEHYDE.
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) | 1965-05-07 | 1965-11-06 | 1966-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-05-07 | 1969-11-06 | 1970-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-05-07 | 1973-11-06 | 1974-05-08 | $7700.00 | Window Closed / Lapsed |