Patent US3683917A successfully refreshed from Google Patents.
US3683917A
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Absorbent product comprising a fluid impervious barrier of a repellent tissue and a hydrocolloid
Assignee: JOHN M COMERFORD
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Filing: 1970-03-24
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Granted: 1972-08-15
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Expires: 1990-03-24
Abstract
Abstract An absorbent product for absorbing and retaining body fluids and exudates comprising a cellulosic absorbent body or core, a cellulosic covering or facing material, and a biodegradable, water imprevious barrier sheet or layer comprising a cellulosic tissue having a basis weight of from about 6 pounds to about 30 pounds, a water repellent material deposited on the cellulosic tissue in an amount equal to from about 0.1 percent by weight to about 0.5 percent by weight, based on the weight of the treated tissue, whereby the cellulosic tissue is classified as a repellent tissue, and from about 0.002 to about 0.03 gram per square inch of a hydrocolloidal material on the repellent tissue, said hydrocolloidal material being capable of swelling in body fluids and exudates and cooperating with the repellent tissue to form an impervious barrier to body fluids and exudates.
Inventors
- 👤 John M Comerford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:49
CPC Classifications
A; A61; A61L; A61L15/00; A61L15/16; A61L15/42; A61L15/62; A61F; A61F13/00; A61F13/15; A61F13/15203; A61F13/15252; A61L15/22; A61L15/28; A61L15/52; A61F13/53; A61F13/534; A61F13/51; A61F13/514; A61F13/51401; A61F2013/51441; A61F2013/51443; A61F2013/530131; A61F2013/530481; A61F2013/53445
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
17 words
An absorbent product as defined in claim 1 wherein the water repellent material is a cationic starch.
Claim 2
Dependent Claim
16 words
An absorbent product as defined in claim 1 wherein the water repellent material is a fluorocarbon.
Claim 3
Dependent Claim
16 words
An absorbent product as defined in claim 1 wherein the water repellent material is a silicone.
Claim 4
Dependent Claim
28 words
An absorbant product as defined in claim 1 wherein the hydrocolloid is present in an amount equal to from about 0.002 to about 0.03 grams per square inch.
Claim 5
Dependent Claim
15 words
An absorbent product as defined in claim 1 wherein the hydrocolloidal is a guar gum.
Claim 6
Dependent Claim
15 words
An absorbent product as defined in claim 1 wherein the hydrocolloidal is sodium carboxymethyl cellulose.
Claim 7
Dependent Claim
165 words
In a sanitary napkin for absorbing and retaining body fluids and exudates comprising a cellulosic absorbent body, a cellulosic covering material, and a fluid impervious barrier sheet when in use therebetween, the improvement wherein the fluid impervious barrier sheet is biodegradable and comprises: a. a cellulosic tissue having a basis weight of from about 6 to about 30 pounds and a repellency time of less than 4 seconds; b. said tissue carrying water repellent material present in an amount equal to from about 0.1 to about 0.5 percent by weight based on the weight of the tissue, thereby imparting to the water repellent carrying tissue a repellency time of about 15 to about 150 seconds; and c. said water repellent material carrying tissue having deposited, on the surface facing said absorbent body, a hydrocolloidal material; whereby said hydrocolloidal material cooperates with said treated tissue to form a barrier, impervious to body fluids and exudates, when said barrier is in contact with said fluids and exudates.
Claim 8
Dependent Claim
164 words
In a diaper for absorbing and retaining body fluids and exudates comprising a cellulosic absorbent body, a cellulosic covering material, and a fluid impervious barrier sheet when in use therebetween, the improvement wherein the fluid impervious barrier sheet is biodegradable and comprises: a. a cellulosic tissue having a basis weight of from about 6 to about 30 pounds and a repellency time of less than 4 seconds; b. said tissue carrying water repellent material present in an amount equal to from about 0.1 to about 0.5 percent by weight based on the weight of the tissue, thereby imparting to the water repellent carrying tissue a repellency time of about 15 to about 150 seconds; and c. said water repellent material carrying tissue having deposited, on the surface facing said absorbent body, a hydrocolloidal material; whereby said hydrocolloidal material cooperates with said treated tissue to form a barrier, impervious to body fluids and exudates, when said barrier is in contact with said fluids and exudates.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-15 | 1976-02-14 | 1976-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-15 | 1980-02-14 | 1980-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-15 | 1984-02-14 | 1984-08-15 | $7700.00 | Window Closed / Lapsed |