Patent US1891950A successfully refreshed from Google Patents.
Patent US4943286A successfully refreshed from Google Patents.
US4943286A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Patient underpad
Assignee: Individual
•
Filing: 1988-12-30
•
Granted: 1990-07-24
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Expires: 2008-12-30
Abstract
Abstract An absortent re-usable patient underpad is formed of four layers of fabric comprisig from to top bottom: a polyester-rayon needle form non-woven fabric, non-woven polyester; thermoplastic unrethane; and a synthetic fleece warpknit fabric. The first layer is placed through an iron and heated to temperatures substantially at 380 to 400 degrees F. the second, third, and fourth layers are bonded together.
Inventors
- 👤 Kenneth W. Armstead
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:37
CPC Classifications
A; A61; A61F; A61F5/00; A61F5/48; A61F5/485
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
55 words
An improved reusable patient underpad comprising: (a) a top absorbent layer of heat-treated polyester rayon needle form non-woven fabric; (b) a second layer of non-woven polyester; (c) a third layer of water impervious synthetic material, bonded to said second layer; and (d) a fourth layer of synthetic fleece warpknit fabric bonded to said third layer.
Claim 2
Dependent Claim
55 words
An improved reusable patient underpad comprising: (a) a top absorbent layer of heat-treated polyester rayon needle form non-woven fabric; (b) a second layer of non-woven polyester; (c) a third layer of water impervious synthetic material, bonded to said second layer; and (d) a fourth layer of synthetic fleece warpknit fabric bonded to said third layer.
Claim 3
Dependent Claim
18 words
The underpad of claim 1 wherein said top layer is heat-treated to substantially 350 to 380 degrees F.
Claim 4
Dependent Claim
28 words
The underpad of claim 2 wherein said third layer is heat bonded to said second layer and said fourth layer by use of films of thermoplastic urethane ester.
Claim 5
Dependent Claim
13 words
The underpad of claim 3 wherein said third layer comprises thermoplastic urethane ether.
Claim 6
Dependent Claim
68 words
An improved reusable patient underpad comprising: (a) a top layer of absorbent acrylic-polyester-rayon needle form non-woven fabric heat treated to substantially 300 to 380 degrees F.; (b) a second layer of non-woven polyester; (c) a third layer of thermoplastic urethane ether; (d) a fourth layer of synethetic fleece warpknit; (e) wherein said third layer is heat-bonded to said second and fourth layers using films of thermoplastic urethane ester.
Claim 7
Dependent Claim
68 words
An improved reusable patient underpad comprising: (a) a top layer of absorbent acrylic-polyester-rayon needle form non-woven fabric heat treated to substantially 300 to 380 degrees F.; (b) a second layer of non-woven polyester; (c) a third layer of thermoplastic urethane ether; (d) a fourth layer of synethetic fleece warpknit; (e) wherein said third layer is heat-bonded to said second and fourth layers using films of thermoplastic urethane ester.
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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) | 1993-07-23 | 1994-01-22 | 1994-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-23 | 1998-01-22 | 1998-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-23 | 2002-01-22 | 2002-07-24 | $7700.00 | Window Closed / Lapsed |