Patent US4073334A successfully refreshed from Google Patents.
Patent US2853395A successfully refreshed from Google Patents.
US2853395A
Expired / Lapsed
US
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Cellulosic sponge process
Assignee: EIDP Inc
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Filing: 1954-03-12
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Granted: 1958-09-23
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Expires: 1974-03-12
Abstract
No abstract record available.
Inventors
- 👤 Osborn Robert Otto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:39
CPC Classifications
C; C08; C08J; C08J9/00; C08J2301/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
IN THE MANUFACTURE OF CELLUISOIC SPONGES WHEREIN VISCOSE, REINFORCING FIBERS, AND A PORE-FORMING SUBSTANCE ARE COMBINED TO FORM A SPONGE MIX WHICH IS THEN COAGULATED, REGENERATED, AND PURIFICED TO FORM A SPONE STRUCTURE, THE IMPROVEMENT WHICH COMPRISES THE STEPS OF DISPERSING SAID REINFORCING FIBERS IN A LIQUID MEDIUM CONSISTING OF A MEMBER SELECTED FROM THE GROUP CONSISTING OF WATER AND DILUTE AQUEOUS CAUSTIC SODA SOLUTION, AND THEREAFTER MIXING THE RESULTING DISPERSION WITH CELLULOSE XANTHATE, WHEREBY TO FORM VISCOSE HAVING REINFORCING FBERS UNIFORMLY DISTRIBUTED THERETHROUGH.
Claim 2
Dependent Claim
84 words
IN THE MANUFACTURE OF CELLUISOIC SPONGES WHEREIN VISCOSE, REINFORCING FIBERS, AND A PORE-FORMING SUBSTANCE ARE COMBINED TO FORM A SPONGE MIX WHICH IS THEN COAGULATED, REGENERATED, AND PURIFICED TO FORM A SPONE STRUCTURE, THE IMPROVEMENT WHICH COMPRISES THE STEPS OF DISPERSING SAID REINFORCING FIBERS IN A LIQUID MEDIUM CONSISTING OF A MEMBER SELECTED FROM THE GROUP CONSISTING OF WATER AND DILUTE AQUEOUS CAUSTIC SODA SOLUTION, AND THEREAFTER MIXING THE RESULTING DISPERSION WITH CELLULOSE XANTHATE, WHEREBY TO FORM VISCOSE HAVING REINFORCING FBERS UNIFORMLY DISTRIBUTED THERETHROUGH.
References Cited (Backward Citations)
US1974393A
Cited
GB438851A
Cited
US2266313A
Cited
US2331936A
Cited
FR866132A
Cited
US2354260A
Cited
US2495237A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-22 | 1962-03-24 | 1962-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-22 | 1966-03-24 | 1966-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-22 | 1970-03-24 | 1970-09-23 | $7700.00 | Window Closed / Lapsed |