Patent US2561577A successfully refreshed from Google Patents.
Patent US3190843A successfully refreshed from Google Patents.
US3190843A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of making a modified polyvinyl alcohol foam
Assignee: Kalle GmbH and Co KG
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Filing: 1961-03-13
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Granted: 1965-06-22
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Expires: 1981-03-13
Abstract
No abstract record available.
Inventors
- 👤 Hofelmann Hans
- 👤 Braun Robert
- 👤 Kahrs Karl Heinz
- 👤 Winkler Fritz
- 👤 Zimmermann Wolfgang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:09
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/30; C08F; C08F8/00; C08F2800/00; C08F2800/20; C08J2329/00; C08J2329/14; Y; Y10; Y10S; Y10S521/00; Y10S521/905
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
A PROCESS FOR THE PREPARATION OF A SPONGE MATERIAL WHICH COMPRISES REACTING AT A TEMPERATURE BETWEEN 20 AND 70*C. IN THE PRESENCE OF AN ACID CATALYST (A) AT LEAST ONE ALDEHYDE SELECTED FROM THE GROUP CONSISTING OF FORMALDEHYDE AND AN ACIDIC ALDEHYDE SAID ACIDIC ALDEHYDE BEING SELECTED FROM THE GROUP CONSISTING OF GLYOXYLIC ACID, BUTYRALDEHYDE SULFONIC ACID AND BENZALDEHYDE DISULFONIC ACID AND (B) A FOAMED AQUEOUS SOLUTION COMPRISING HYDROLYZED POLYVINYL ACETATE WHICH HAS BEEN REACTED WITH A COMPOUND SELECTED FROM THE GROUP CONSISTING OF (A) POLYETHYLENE GLYCOL, (B) POLYPROPYLENE GLYCOL AND (C) A MONOMER SELECTED FROM THE GROUP CONSISTNG OF MALEIC, CROTONIC, ITACONIC, FUMARIC, ACRYLIC, METACRYLIC, VINYL SULFONIC, VINYLPHOSPHONIC ACIDS, AND ALKYLESTERS OF SAID ACIDS WHEREIN THE ALKYL GROUP CONTAINS FROM 1-2 CARBON ATOMS.
Claim 2
Dependent Claim
124 words
A PROCESS FOR THE PREPARATION OF A SPONGE MATERIAL WHICH COMPRISES REACTING AT A TEMPERATURE BETWEEN 20 AND 70*C. IN THE PRESENCE OF AN ACID CATALYST (A) AT LEAST ONE ALDEHYDE SELECTED FROM THE GROUP CONSISTING OF FORMALDEHYDE AND AN ACIDIC ALDEHYDE SAID ACIDIC ALDEHYDE BEING SELECTED FROM THE GROUP CONSISTING OF GLYOXYLIC ACID, BUTYRALDEHYDE SULFONIC ACID AND BENZALDEHYDE DISULFONIC ACID AND (B) A FOAMED AQUEOUS SOLUTION COMPRISING HYDROLYZED POLYVINYL ACETATE WHICH HAS BEEN REACTED WITH A COMPOUND SELECTED FROM THE GROUP CONSISTING OF (A) POLYETHYLENE GLYCOL, (B) POLYPROPYLENE GLYCOL AND (C) A MONOMER SELECTED FROM THE GROUP CONSISTNG OF MALEIC, CROTONIC, ITACONIC, FUMARIC, ACRYLIC, METACRYLIC, VINYL SULFONIC, VINYLPHOSPHONIC ACIDS, AND ALKYLESTERS OF SAID ACIDS WHEREIN THE ALKYL GROUP CONTAINS FROM 1-2 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) | 1968-06-21 | 1968-12-21 | 1969-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-06-21 | 1972-12-21 | 1973-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-06-21 | 1976-12-21 | 1977-06-22 | $7700.00 | Window Closed / Lapsed |