Patent US3669103A successfully refreshed from Google Patents.
US3669103A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Absorbent product containing a hydrocelloidal composition
Assignee: Dow Chemical Co
•
Filing: 1966-05-31
•
Granted: 1972-06-13
•
Expires: 1986-05-31
Abstract
Abstract Articles having improved absorbency for aqueous body fluids consist of body-conforming supports containing dry, solid waterswellable, water-insoluble polymeric sorbents which are lightly cross-linked polymers, such as polyvinylpyrrolidones, sulfonated polystyrenes, sulfonated polyvinyltoluenes, poly-sulfoethyl acrylates, poly-2-hydroxyethyl acrylates, polyacrylates, hydrolyzed polyacrylamides and copolymers of acrylamide with acrylic acid.
Inventors
- 👤 Billy Gene Harper
- 👤 Robert Niles Bashaw
- 👤 Bobby Leroy Atkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:26
CPC Classifications
A; A61; A61L; A61L27/00; A61L27/14; A61L27/16; A61L15/00; A61L15/16; A61L15/42; A61L15/60; A61L27/18
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
15 words
Article of claim 1 wherein the polymeric sorbent is a lightly cross-linked, partially hydrolyzed polyacrylamide.
Claim 2
Dependent Claim
29 words
Article of claim 1 wherein the polymeric sorbent is a copolymer of acrylamide and acrylic acid cross-linked with from about 0.05 to about 1.5 percent by weight of N,N''-methylenebisacrylamide.
Claim 3
Dependent Claim
13 words
Article of claim 3 wherein the support consists of a water-insoluble polyurethane foam.
Claim 4
Dependent Claim
23 words
Article of claim 1 in which the support is a fibrous material selected from cloth fabric, paper, synthetic foam resin, and felted fibers.
Claim 5
Dependent Claim
19 words
Article of claim 1 in which the polymer is originally supplied to the said article as a particulate solid.
Claim 6
Dependent Claim
29 words
Article of claim 1 in which the polymer is originally supplied to the said article as elongate fibers, of which one dimension is substantially greater than the other two.
Claim 7
Dependent Claim
89 words
As an article of manufacture, a flexible support adapted to be caused to conform to a surface of an animal body, said support confining a dry, solid, water-swellable, water-insoluble, physiologically unobjectionable polymeric sorbent so as to present said sorbent for the sorption of aqueous fluid elaborated by the animal to which said article is applied and said polymeric sorbent being a lightly cross-linked polymer and being selected from the group consisting of hydrolyzed polyacrylamide, polyacrylic acid, copolymers of acrylamide and acrylic acid, and alkali metal salts of said polymers.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-13 | 1975-12-13 | 1976-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-13 | 1979-12-13 | 1980-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-13 | 1983-12-13 | 1984-06-13 | $7700.00 | Window Closed / Lapsed |