US2846407A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a detergent and solvent resistant sponge material
Assignee: Individual
•
Filing: 1954-01-13
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Granted: 1958-08-05
•
Expires: 1974-01-13
Abstract
No abstract record available.
Inventors
- 👤 Wilson Christopher Lumley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:21
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/36; C08J2329/00; C08J2329/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
A METHOD OF INCREASING THE DETERGENT AND ORGANIC SOLVENT RESISTANCE OF A SPONGE COMPRISING A REACTION PRODUCT OF POLYVINYL ALCOHOL AND FORMALDEHYDE IN WHICH 35 TO 80% OF THE HYDROXYL GROUPS OF SAID POLYVINYL ALCOHOL HAVE BEEN REACTED, COMPRISING IMMERSING SAID SPONGE IN AN AQUEOUS SOLUTION OF A DIALDEHYDE CONTAINING MORE THAN TWO CARBON ATOMS PER MOLECULE, IN THE PRESENCE OF A MINERAL ACID CATALYST, AT A CONCENTRATION OF SAID DIALDEHYDE, IMMERSION TEMPERATURE AND OVER A TIME CORRELATED TO REACT FROM ABOUT 0.2 TO ABOUT 4.0 GRAMS OF DIALDEHYDE PER 100 GRAMS OF SPONGE.
Claim 2
Independent Claim
94 words
A METHOD OF INCREASING THE DETERGENT AND ORGANIC SOLVENT RESISTANCE OF A SPONGE COMPRISING A REACTION PRODUCT OF POLYVINYL ALCOHOL AND FORMALDEHYDE IN WHICH 35 TO 80% OF THE HYDROXYL GROUPS OF SAID POLYVINYL ALCOHOL HAVE BEEN REACTED, COMPRISING IMMERSING SAID SPONGE IN AN AQUEOUS SOLUTION OF A DIALDEHYDE CONTAINING MORE THAN TWO CARBON ATOMS PER MOLECULE, IN THE PRESENCE OF A MINERAL ACID CATALYST, AT A CONCENTRATION OF SAID DIALDEHYDE, IMMERSION TEMPERATURE AND OVER A TIME CORRELATED TO REACT FROM ABOUT 0.2 TO ABOUT 4.0 GRAMS OF DIALDEHYDE PER 100 GRAMS OF SPONGE.
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) | 1961-08-04 | 1962-02-03 | 1962-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-04 | 1966-02-03 | 1966-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-04 | 1970-02-03 | 1970-08-05 | $7700.00 | Window Closed / Lapsed |