US3954493A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Regenerated cellulose sponge
Assignee: Avicon Inc
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Filing: 1974-05-20
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Granted: 1976-05-04
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Expires: 1994-05-20
Abstract
Abstract Regenerated cellulose sponges of increased absorbency and rate of absorption formed by impregnating the sponge material with a solution or dispersion containing from 0.005% to 0.25% of a water-soluble or water-dispersible, high molecular weight, hydrophylic, film-forming polymer, drying the impregnated sponge and compressing it. The presence of the film-forming polymer allows the cutting of desired shaped individual sponges from the treated sponge material with a minimal formation of lint particles on the cut surfaces.
Inventors
- 👤 Orlando A. Battista
- 👤 Richard L. Ward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:03
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/36; C08J9/40; C08J9/42; A; A61; A61L; A61L15/00; A61L15/16; A61L15/22; A61L15/28; A61L15/32; A61L15/325; A61L15/42; A61L15/425; C08J2301/00; C08J2401/00; C08J2489/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
107 words
A compressed regenerated cellulose sponge consisting essentially of regenerated cellulose and from abot 0.15 to about 2.5% of a water-soluble or water-dispersible, high molecular weight, hydrophylic, film-forming polymer uniformly distributed throughout the sponge, the sponge being characterized in absorbing at least 25 times its weight of water and having a bulk density of at least 7 lbs./cu. ft. and, in contrast to a like regenerated cellulose sponge free of such film-forming polymer, exhibiting an increased liquid absorbency and, upon wetting, exhibiting a reduced lint formation along cut surfaces and, in contrast to a like regenerated cellulose sponge coated with such film-forming polymer, exhibiting an increased liquid absorbency.
Claim 2
Dependent Claim
107 words
A compressed regenerated cellulose sponge consisting essentially of regenerated cellulose and from abot 0.15 to about 2.5% of a water-soluble or water-dispersible, high molecular weight, hydrophylic, film-forming polymer uniformly distributed throughout the sponge, the sponge being characterized in absorbing at least 25 times its weight of water and having a bulk density of at least 7 lbs./cu. ft. and, in contrast to a like regenerated cellulose sponge free of such film-forming polymer, exhibiting an increased liquid absorbency and, upon wetting, exhibiting a reduced lint formation along cut surfaces and, in contrast to a like regenerated cellulose sponge coated with such film-forming polymer, exhibiting an increased liquid absorbency.
Claim 3
Dependent Claim
26 words
A compressed regenerated cellulose sponge as defined in claim 1 wherein the compressed sponge has a bulk density of between about 7 lbs./cu.ft. and 50 lbs./cu.ft.
Claim 4
Dependent Claim
20 words
A compressed regenerated cellulose sponge as defined in claim 2 containing about 0.4 to about 1.25% of the film-forming polymer.
Claim 5
Dependent Claim
17 words
A compressed regenerated cellulose sponge as defined in claim 1 wherein the film-forming polymer is regenerated cellulose.
Claim 6
Dependent Claim
18 words
A compressed regenerated cellulose sponge as defined in claim 1 wherein the the film-forming polymer is microcrystalline collagen.
Claim 7
Dependent Claim
16 words
A compressed regenerated cellulose sponge as defined in claim 1 wherein the film-forming polymer is gelatin.
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) | 1979-05-04 | 1979-11-03 | 1980-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-04 | 1983-11-03 | 1984-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-04 | 1987-11-03 | 1988-05-04 | $7700.00 | Window Closed / Lapsed |