US3839138A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dimensionally stable hydrophilic foam and method of preparing same
Assignee: Individual
•
Filing: 1973-04-09
•
Granted: 1974-10-01
•
Expires: 1993-04-09
Abstract
Abstract Resilient, crosslinked, hydrophilic, open-celled polyoxyalkylene urea/urethane foam comprising hydrophilic and hydrophobic segments of relatively high molecular weight, the foams having relatively high resistance to bottoming out and good dimensional stability with absorption of water, and a process for preparing the same.
Inventors
- 👤 R Kyle
- 👤 J Kistner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:08
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; B; B32; B32B; B32B5/00; B32B5/02; B32B5/022; B32B17/00; B32B17/02; B32B5/024; C08G18/28; C08G18/40; C08G18/48; C08G18/4833; B32B2437/00; B32B2437/02; C08G2110/00; C08G2110/0008; C08G2110/0033; C08G2110/0041; C08G2110/0058; C08G2110/0066; C08G2110/0083; Y; Y10; Y10S; Y10S521/00; Y10S521/905; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T442/00; Y10T442/60; Y10T442/647; Y10T442/682
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
81 words
A UNITARY ARTICLE COMPRISING IN COMBINATION A RESILIENT, CROSSLINKED, HYDROPHILIC, OPEN-CELLED POLYOXYALKYLENE UREA/URETHANE FOAM PORTION COMPRISING TWO TYPES OF RELATIVELY HIGH MOLECULAR WEIGHT SEGMENTS AS FOLLOWS: A. HYDROPHILLIC SEGMENTS, CONTAINING POLYOXYALKYLENE CHAINS PREDOMINENTLY INTERCONNECTED BY UREA LINKS, AT LEAST 50 PERCENT OF THE INDIVIDUAL OXYALKYLENE GROUPS THEREIN BEING OXYETHYLENE GROUPS, AND B. HYDROPHOBIC SEGMENTS CONTAINING POLYOXYALKYLENE CHAINS AND AROMATIC HYDROCARBON GROUPS PREDOMINENTLY INTERCONNECTED BY URETHANE LINKS, THE INDIVIDUAL OXYALKYLENE GROUPS SUBSTANTIALLY AL CONTAINING MORE THAN TWO CARBON ATOMS, THE FOAM HAVING
Claim 2
Dependent Claim
81 words
A UNITARY ARTICLE COMPRISING IN COMBINATION A RESILIENT, CROSSLINKED, HYDROPHILIC, OPEN-CELLED POLYOXYALKYLENE UREA/URETHANE FOAM PORTION COMPRISING TWO TYPES OF RELATIVELY HIGH MOLECULAR WEIGHT SEGMENTS AS FOLLOWS: A. HYDROPHILLIC SEGMENTS, CONTAINING POLYOXYALKYLENE CHAINS PREDOMINENTLY INTERCONNECTED BY UREA LINKS, AT LEAST 50 PERCENT OF THE INDIVIDUAL OXYALKYLENE GROUPS THEREIN BEING OXYETHYLENE GROUPS, AND B. HYDROPHOBIC SEGMENTS CONTAINING POLYOXYALKYLENE CHAINS AND AROMATIC HYDROCARBON GROUPS PREDOMINENTLY INTERCONNECTED BY URETHANE LINKS, THE INDIVIDUAL OXYALKYLENE GROUPS SUBSTANTIALLY AL CONTAINING MORE THAN TWO CARBON ATOMS, THE FOAM HAVING
Claim 3
Dependent Claim
12 words
A WATER ABSORBING CAPACITY OF AT LEAST ABOUT 700 PERCENT BY WEIGHT.
Claim 4
Dependent Claim
12 words
A WATER ABSORBING CAPACITY OF AT LEAST ABOUT 700 PERCENT BY WEIGHT.
Claim 5
Dependent Claim
12 words
A DENSITY OF AT LEAST 8 POUNDS PER CUBIC FOOT (125 KG/M3).
Claim 6
Dependent Claim
12 words
A DENSITY OF AT LEAST 8 POUNDS PER CUBIC FOOT (125 KG/M3).
Claim 7
Dependent Claim
12 words
A density of at least 8 pounds per cubic foot (125 kg/m3).
Claim 8
Dependent Claim
12 words
A density of at least 8 pounds per cubic foot (125 kg/m3).
Claim 9
Dependent Claim
18 words
A unitary article according to claim 1 wherein the fibrous assembly portion is a needle punched non-woven web.
Claim 10
Dependent Claim
19 words
A unitary article according to claim 2 wherein the foam and fibrous assembly portions are joined by needle punching.
Claim 11
Dependent Claim
18 words
A volume change upon absorption of water of less than 0.4 percent per weight percent of absorbed water.
Claim 12
Dependent Claim
18 words
A volume change upon absorption of water of less than 0.4 percent per weight percent of absorbed water.
Claim 13
Dependent Claim
18 words
A VOLUME CHANGE UPON ABSORPTION OF WATER OF LESS THAN 0.4 PERCENT PER WEIGHT PERCENT OF ABSORBED WATER.
Claim 14
Dependent Claim
18 words
A VOLUME CHANGE UPON ABSORPTION OF WATER OF LESS THAN 0.4 PERCENT PER WEIGHT PERCENT OF ABSORBED WATER.
Claim 15
Dependent Claim
10 words
A 24 HOUR COMPRESSION SET OF LESS THAN 75 PERCENT.
Claim 16
Dependent Claim
10 words
A 24 HOUR COMPRESSION SET OF LESS THAN 75 PERCENT.
Claim 17
Dependent Claim
10 words
A 24 hour compression set of less than 75 percent.
Claim 18
Dependent Claim
10 words
A 24 hour compression set of less than 75 percent.
Claim 19
Dependent Claim
20 words
A bound water pickup of at least about 100 percent by weight, and, integrally joined thereto, a fibrous assembly portion.
Claim 20
Dependent Claim
20 words
A bound water pickup of at least about 100 percent by weight, and, integrally joined thereto, a fibrous assembly portion.
Claim 21
Dependent Claim
20 words
A BOUND WATER PICKUP OF AT LEAST ABOUT 100 PERCENT BY WEIGHT, AND, INTEGRALLY JOINED THERETO, A FIBROUS ASSEMBLY PORTION.
Claim 22
Dependent Claim
20 words
A BOUND WATER PICKUP OF AT LEAST ABOUT 100 PERCENT BY WEIGHT, AND, INTEGRALLY JOINED THERETO, A FIBROUS ASSEMBLY PORTION.
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) | 1977-09-30 | 1978-04-01 | 1978-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-30 | 1982-04-01 | 1982-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-30 | 1986-04-01 | 1986-10-01 | $7700.00 | Window Closed / Lapsed |