US2659935A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making compressed sponges
Assignee: Individual
•
Filing: 1950-03-18
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Granted: 1953-11-24
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Expires: 1970-03-18
Abstract
No abstract record available.
Inventors
- 👤 Hammon Henry George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:19
CPC Classifications
B; B29; B29C; B29C43/00; B29C43/003; C; C08; C08J; C08J9/00; C08J9/36; B29K; B29K2105/00; B29K2105/04; C08J2329/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
83 words
THE METHOD OF MAKING A COMPRESSED SPONGE WHICH COMPRISES PROVIDING A POLYVINYL FORMAL SPONGE HAVING INTERCONNECTED PORES THROUGHOUT, PREPARED FROM POLYVINYL ALCOHOL AND HAVING FROM 35 TO 80% OF THE HYDROXYL GROUPS OF THE ALCOHOL REACTED, SAID SPONGE CONTAINING NOT MORE THAN ABOUT 3% WATER, AND COMPRESSING SAID SPONGE UNDER A PRESSURE SUFFICIENT TO REDUCE MATERIALLY THE BULK OF SAID SPONGE, SAID SPONGE BEING MAINTAINED DURING THE COMPRESSING STEP AT A TEMPERATURE LESS THAN THAT AT WHICH THE SPONGE ASSUMES A PERMANENT SET.
Claim 2
Independent Claim
83 words
THE METHOD OF MAKING A COMPRESSED SPONGE WHICH COMPRISES PROVIDING A POLYVINYL FORMAL SPONGE HAVING INTERCONNECTED PORES THROUGHOUT, PREPARED FROM POLYVINYL ALCOHOL AND HAVING FROM 35 TO 80% OF THE HYDROXYL GROUPS OF THE ALCOHOL REACTED, SAID SPONGE CONTAINING NOT MORE THAN ABOUT 3% WATER, AND COMPRESSING SAID SPONGE UNDER A PRESSURE SUFFICIENT TO REDUCE MATERIALLY THE BULK OF SAID SPONGE, SAID SPONGE BEING MAINTAINED DURING THE COMPRESSING STEP AT A TEMPERATURE LESS THAN THAT AT WHICH THE SPONGE ASSUMES A PERMANENT SET.
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) | 1956-11-23 | 1957-05-25 | 1957-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-23 | 1961-05-25 | 1961-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-23 | 1965-05-25 | 1965-11-24 | $7700.00 | Window Closed / Lapsed |