US3900910A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water pillow
Assignee: Individual
•
Filing: 1973-03-20
•
Granted: 1975-08-26
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Expires: 1993-03-20
Abstract
Abstract The disclosure relates to a water pillow made of flexible waterproof material having a pair of cavities formed therein, one on the top wall and one on the bottom wall, the central portions of the cavities being connected together. The bottom wall includes concave grooves therein in the form of circular arcs concentric with the cavity in the bottom wall.
Inventors
- 👤 Yuuichi Nakata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:57
CPC Classifications
A; A47; A47G; A47G9/00; A47G9/10; A47G2009/008; Y; Y10; Y10S; Y10S5/00; Y10S5/924
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
103 words
A water pillow comprising: a flexible waterproof hollow enclosure in the form of a pillow, the upper surface of the enclosure having a concavity therein substantially centrally thereof, for receiving the head of a user, the lower wall of the enclosure being provided with a plurality of upwardly projecting hollow flexible ridges about the concavity terminating short of the top wall of the enclosure, said ridges being compressible in response to pressure applied to the water by a user''s head to provide space for receiving the volume of water displaced by such pressure, said enclosure being provided with an inlet for the water.
Claim 2
Dependent Claim
103 words
A water pillow comprising: a flexible waterproof hollow enclosure in the form of a pillow, the upper surface of the enclosure having a concavity therein substantially centrally thereof, for receiving the head of a user, the lower wall of the enclosure being provided with a plurality of upwardly projecting hollow flexible ridges about the concavity terminating short of the top wall of the enclosure, said ridges being compressible in response to pressure applied to the water by a user''s head to provide space for receiving the volume of water displaced by such pressure, said enclosure being provided with an inlet for the water.
Claim 3
Dependent Claim
22 words
A water pillow according to claim 1 wherein said ridges are of arcuate shape substantially concentric with the center of the concavity.
Claim 4
Dependent Claim
27 words
A water pillow according to claim 1 wherein the outer surface of the bottom wall of the enclosure is indented to form said ridges within the enclosure.
Claim 5
Dependent Claim
25 words
A water pillow according to claim 3 wherein said indentations and resulting ridges are of arcuate shape substantially concentric with the center of the concavity.
Claim 6
Dependent Claim
28 words
A water pillow according to claim 1 wherein the upper surface of the pillow is provided with a roughened area for preventing slipping of a cover disposed thereon.
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) | 1978-08-25 | 1979-02-24 | 1979-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-25 | 1983-02-24 | 1983-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-25 | 1987-02-24 | 1987-08-26 | $7700.00 | Window Closed / Lapsed |