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US4495082A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water-absorbent
Assignee: National Institute of Advanced Industrial Science and Technology
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Filing: 1980-03-14
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Granted: 1985-01-22
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Expires: 2000-03-14
Abstract
Abstract A water-absorbent excellent in water-holding capacity under pressure, which comprises a cotton-like material A manufactured by a pulping treatment of bagasse containing pith and having a lignin content of at least 5% by weight and a cotton-like fibers B having a lignin content of not greater than 5% by weight. This water-absorbent is suitable as a sanitary material for manufacturing diapers, hygienic napkins or tampons.
Inventors
- 👤 Akio Mita
- 👤 Susumu Kashiwabara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:48
CPC Classifications
A; A61; A61F; A61F13/00; A61F13/15; A61F13/53; A61L; A61L15/00; A61L15/16; A61L15/40; A61F13/20; A61F13/2002; A61F13/202; A61F2013/530131; Y; Y10; Y10S; Y10S604/00; Y10S604/904
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
70 words
A water-absorbent which comprises a mixture of a pulp A manufactured by a pulping treatment of bagasse containing at least 5% by weight of pith and having a lignin content of 5-25% by weight and a pulp B having a lignin content of not greater than 5% by weight, wherein the ratio by weight of pulp A to pulp B (A/B) is within the range of from 95/5 to 20/80.
Claim 2
Dependent Claim
70 words
A water-absorbent which comprises a mixture of a pulp A manufactured by a pulping treatment of bagasse containing at least 5% by weight of pith and having a lignin content of 5-25% by weight and a pulp B having a lignin content of not greater than 5% by weight, wherein the ratio by weight of pulp A to pulp B (A/B) is within the range of from 95/5 to 20/80.
Claim 3
Dependent Claim
34 words
The water-absorbent according to claim 1, wherein the pulp A has a bulk density of 5-40 g/l, preferably 30-40 g/l and the pulp B has a bulk density of 5-40 g/l, preferably 25-40 g/l.
Claim 4
Dependent Claim
11 words
The water-absorbent of claim 1 wherein the water-absorbent is a diaper.
Claim 5
Dependent Claim
12 words
The water-absorbent of claim 1 wherein the water-absorbent is a hygenic napkin.
Claim 6
Dependent Claim
11 words
The water-absorbent of claim 1 wherein the water-absorbent is a tampon.
Claim 7
Dependent Claim
93 words
A water-absorbent composite capable of absorbing and holding water, urine, blood and other aqueous liquids which comprises a mixture of pulp A manufactured by the chemical and physical treatment of bagasse containing at least 5% by weight of pith and having a lignin content of 5-25% by weight, and pulp B manufactured by the chemical and physical treatment of cotton-like fibers having a lignin content of not greater than 5% by weight, wherein the ratio by weight of pulp A to pulp B (A/B) is within the range of from 95/5 to 20/80.
Claim 8
Dependent Claim
93 words
A water-absorbent composite capable of absorbing and holding water, urine, blood and other aqueous liquids which comprises a mixture of pulp A manufactured by the chemical and physical treatment of bagasse containing at least 5% by weight of pith and having a lignin content of 5-25% by weight, and pulp B manufactured by the chemical and physical treatment of cotton-like fibers having a lignin content of not greater than 5% by weight, wherein the ratio by weight of pulp A to pulp B (A/B) is within the range of from 95/5 to 20/80.
Claim 9
Dependent Claim
19 words
The water-absorbent of claim 6 wherein pulp B is made from broad-leaved trees, needle-leaved trees, straw, bamboo and bagasse.
References Cited (Backward Citations)
US3935363A
Cited
US4190563A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-01-22 | 1988-07-23 | 1989-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-22 | 1992-07-23 | 1993-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-22 | 1996-07-23 | 1997-01-22 | $7700.00 | Window Closed / Lapsed |