Patent US3232916A successfully refreshed from Google Patents.
US3232916A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cross-linked membranes of polyvinyl alcohol
Assignee: Honeywell International Inc
•
Filing: 1962-04-17
•
Granted: 1966-02-01
•
Expires: 1982-04-17
Abstract
No abstract record available.
Inventors
- 👤 Merlyn W Fogle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:18
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/15; C08K5/151; C08K5/1515; B; B01; B01D; B01D71/00; B01D71/06; B01D71/38; B01D71/381; B01D71/383; C08F; C08F8/00; C08K3/00; C08K3/38; C08F2810/00; C08F2810/20
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
78 words
THE PROCESS OF MAKING WATER INSOLUBLE FILMS COMPRISING DISSOLVING PARTIALLY SAPONIFIED POLYVINYL ACETATE BEING IN A WATER-ALCHOL SOLUTION, SAID POLYVINYL ACETATE BEING SAPONIFIED TO THE EXTENT THAT IT IS SOLUBLE IN THE WATERALCOHOL SOLUTION, ADDING THERETO DIGLYCIDYL ETHER OF GLYCERINE AND FLUOROBORIC ACID,FORMING THE FILM FROM THE SOLUTION, DRYING THE FILM, CURING THE FILM AT AN ELEVATED TEMPERATURE, AND THEREAFTER REMOVING THE ACETATE FROM THE FILM BY IMMERSION THE FILM IN A SOLUTION OF SODIUM HYDROXIDE AND WATER.
Claim 2
Dependent Claim
78 words
THE PROCESS OF MAKING WATER INSOLUBLE FILMS COMPRISING DISSOLVING PARTIALLY SAPONIFIED POLYVINYL ACETATE BEING IN A WATER-ALCHOL SOLUTION, SAID POLYVINYL ACETATE BEING SAPONIFIED TO THE EXTENT THAT IT IS SOLUBLE IN THE WATERALCOHOL SOLUTION, ADDING THERETO DIGLYCIDYL ETHER OF GLYCERINE AND FLUOROBORIC ACID,FORMING THE FILM FROM THE SOLUTION, DRYING THE FILM, CURING THE FILM AT AN ELEVATED TEMPERATURE, AND THEREAFTER REMOVING THE ACETATE FROM THE FILM BY IMMERSION THE FILM IN A SOLUTION OF SODIUM HYDROXIDE AND WATER.
Claim 3
Dependent Claim
63 words
A FILM OF POLYVINYL ALCOHOL WHICH IS INSOLUBLE IN ACIDIC AND BASIC AQUEOUS SOLUTIONS OF ELECTROLYTES, HAVING CROSS-LINKING GROUPS BETWEEN THE POLYMER MOLECULES, FORMED WHEN A COMPOUND OF DIGLYCIDYL ETHER OF BIS (4,4'' HYDROXY PHENOL) METHANE REACTS IN THE PRESENCE OF A FLUOBORIC ACID CATALYST WITH THE POLYMER MOLECULES TO FORM ETHER-TYPE BONDS WHICH ARE STABLE TOWARD BOTH ACIDIC AND BASIC AQUEOUS SOLUTIONS.
Claim 4
Dependent Claim
63 words
A FILM OF POLYVINYL ALCOHOL WHICH IS INSOLUBLE IN ACIDIC AND BASIC AQUEOUS SOLUTIONS OF ELECTROLYTES, HAVING CROSS-LINKING GROUPS BETWEEN THE POLYMER MOLECULES, FORMED WHEN A COMPOUND OF DIGLYCIDYL ETHER OF BIS (4,4'' HYDROXY PHENOL) METHANE REACTS IN THE PRESENCE OF A FLUOBORIC ACID CATALYST WITH THE POLYMER MOLECULES TO FORM ETHER-TYPE BONDS WHICH ARE STABLE TOWARD BOTH ACIDIC AND BASIC AQUEOUS SOLUTIONS.
References Cited (Backward Citations)
FR805233A
Cited
US2648717A
Cited
US2844570A
Cited
US2941988A
Cited
US2844571A
Cited
US3052652A
Cited
US2990398A
Cited
US3106543A
Cited
US3099646A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-01-31 | 1969-08-02 | 1970-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-31 | 1973-08-02 | 1974-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-31 | 1977-08-02 | 1978-02-01 | $7700.00 | Window Closed / Lapsed |