US3971379A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Absorbent hydrophilic cellulosic product
Assignee: Personal Products Co
•
Filing: 1975-04-04
•
Granted: 1976-07-27
•
Expires: 1995-04-04
Abstract
Abstract An absorbent body is provided for use in such products as catamenial napkins and tampons, diapers, wound dressings and the like, which body incorporates hydrophilic, wet resilient, swellable, cellulosic fibers produced by a single reaction treatment of cellulose. The cellulose fibers are treated with an agent which renders the fibers hydrophilic while simultaneously crosslinking them with a crosslinking radical having the structure: ¦ H- C-CH2)k - X ¦ (CH2)m ¦ H- C-CH2)n - COOY ¦ where X is chosen from the group consisting of H or COOY: Y is chosen from the group consisting of Na, K, Li, Ce or H; and k, m and n are integers ranging from 0 to 4.
Inventors
- 👤 Pronoy Kumar Chatterjee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:13
CPC Classifications
A; A61; A61F; A61F13/00; A61F13/15; A61F13/53; A61F13/534; A61F13/01; A61F13/01008; A61F13/20; A61F13/2002; A61F13/202; A61F13/2051; A61L; A61L15/00; A61L15/16; A61L15/22; A61L15/28; A61F13/53409; A61F2013/00361; A61F2013/00727; A61F2013/00731; A61F2013/530131; A61F2013/530481; A61F2013/530489; A61F2013/530496; A61F2013/53051; A61F2013/53445; Y; Y10; Y10S; Y10S604/00; Y10S604/904; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/25; Y10T428/253
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
91 words
An absorbent body comprising hydrophilic crosslinked cellulose, said cellulose being crosslinked with an oxygen atom of a hydroxy group in an anhydroglucose unit of one cellulose molecule linked to an oxygen atom of a hydroxy group in an anhydroglucose unit of a second cellulose molecule through a crosslinking radical having the structure: ##EQU5## where X is chosen from the group consisting of H or COOY; Y is chosen from the group consisting of Na, K, Li, Ce, or H; and k, m and n are integers ranging from 0 to 4.
Claim 2
Dependent Claim
91 words
An absorbent body comprising hydrophilic crosslinked cellulose, said cellulose being crosslinked with an oxygen atom of a hydroxy group in an anhydroglucose unit of one cellulose molecule linked to an oxygen atom of a hydroxy group in an anhydroglucose unit of a second cellulose molecule through a crosslinking radical having the structure: ##EQU5## where X is chosen from the group consisting of H or COOY; Y is chosen from the group consisting of Na, K, Li, Ce, or H; and k, m and n are integers ranging from 0 to 4.
Claim 3
Dependent Claim
29 words
The absorbent body of claim 1 wherein said hydrophilic crosslinked cellulose has a degree of crosslinking of at least 0.005 moles of crosslinking radical per mole of anhydroglucose unit.
Claim 4
Dependent Claim
29 words
The absorbent body of claim 2 wherein said hydrophilic crosslinked cellulose has a degree of crosslinking of at least 0.015 moles of crosslinking radical per mole of anhydroglucose unit.
Claim 5
Dependent Claim
29 words
The absorbent body of claim 1 wherein said hydrophilic crosslinked cellulose has at least 0.3 moles of --COO(alkalai metal) groups in the crosslinking radical per mole of anhydroglucose unit.
Claim 6
Dependent Claim
28 words
The absorbent body of claim 4 wherein said hydrophilic crosslinked cellulose has at least 0.4 moles --COO(alkalai metal) groups in the crosslinking radical per mole of anhydroglucose unit.
Claim 7
Dependent Claim
14 words
The absorbent body of claim 1 wherein said crosslinking radical has the structure: ##EQU6##
Claim 8
Dependent Claim
14 words
The absorbent body of claim 1 wherein said crosslinking radical has the structure: ##EQU7##
Claim 9
Dependent Claim
99 words
A catamenial device comprising an absorbent body of first absorbent material and hydrophilic crosslinked cellulose, said cellulose being crosslinked with an oxygen atom of a hydroxy group in an anhydroglucose unit of one cellulose molecule linked to an oxygen atom of a hydroxy group in an anhydroglucose unit of a second cellulose molecule through a crosslinking radical having the structure: ##EQU8## where X is chosen from the group consisting of H or COOY, Y is chosen from the group consisting of Na, K, Li, Ce, or H; and k, m and n are integers ranging from 0 to 4.
Claim 10
Dependent Claim
99 words
A catamenial device comprising an absorbent body of first absorbent material and hydrophilic crosslinked cellulose, said cellulose being crosslinked with an oxygen atom of a hydroxy group in an anhydroglucose unit of one cellulose molecule linked to an oxygen atom of a hydroxy group in an anhydroglucose unit of a second cellulose molecule through a crosslinking radical having the structure: ##EQU8## where X is chosen from the group consisting of H or COOY, Y is chosen from the group consisting of Na, K, Li, Ce, or H; and k, m and n are integers ranging from 0 to 4.
Claim 11
Dependent Claim
18 words
The device of claim 8 wherein said hydrophilic crosslinked cellulose is substantially uniformly distributed in the absorbent body.
Claim 12
Dependent Claim
19 words
The device of claim 9 wherein said absorbent body comprises at least one core of said hydrophilic crosslinked cellulose.
Claim 13
Dependent Claim
28 words
The device of claim 10 wherein said absorbent body comprises a plurality of cores of said hydrophilic crosslinked cellulose, said cores being separated by said first absorbent material.
Claim 14
Dependent Claim
13 words
The device of claim 11 wherein said first absorbent material is cellulose fibers.
Claim 15
Dependent Claim
43 words
A tampon comprising the device of claim 11 wherein said absorbent body comprises a pad of said first absorbent material having a layer of said hydrophilic crosslinked cellulose thereon, said pad being rolled into cylindrical form and compressed into the final tampon shape.
Claim 16
Dependent Claim
39 words
A sanitary napkin comprising the device of claim 8 wherein said absorbent body is in the form of a planar pad sandwiched between a backing sheet and a facing sheet, at least one of which is menstrual fluid permeable.
Claim 17
Dependent Claim
21 words
The napkin of claim 14 wherein both sheets are fluid permeable and form a continuous cover sheet enveloping the absorbent body.
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) | 1979-07-27 | 1980-01-26 | 1980-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-27 | 1984-01-26 | 1984-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-27 | 1988-01-26 | 1988-07-27 | $7700.00 | Window Closed / Lapsed |