US3846857A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-section variable density mattress
Assignee: NEUROLOGICAL RES AND DEV GROUP
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Filing: 1973-03-28
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Granted: 1974-11-12
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Expires: 1993-03-28
Abstract
Abstract A mattress possessing particular utility in hospitals and nursing homes reduces the incidence and severity of bed sores, improves muscle tone and reduces back ache. The mattress features plural sections of foam whose densities and degrees of compressibility vary, so that regulated pressures will be applied to different sections of the body for maximum comfort. The mattress may be turned to change the pressure points on the body periodically as the need arises. The mattress is employed in conjunction with a foam padded base or underlay having a relatively rigid component.
Inventors
- 👤 C Weinstock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:35
CPC Classifications
A; A47; A47C; A47C27/00; A47C27/14; A47C27/15; A47C27/148
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
152 words
A mattress made of foam having three distinct sections, said distinct sections being integral and coextensive with each other, said foam material of the first zone having a first density and compressibility factor at 4 inches in the order of 22 to 30 lbs. per cubic foot, said second zone being adjacent to said first zone and having a second density and second compressibility factor, said second zone having a first and second portion, said first portion having a compressibility factor at 4 inches in the order of 37 to 60 lbs. per cubic foot, and said third zone adjacent to said second zone and having a third density and compressibility factor at 4 inches in the order of 22 to 30 lbs. per cubic foot, and said second portion of said second zone having a compressibility factor at 4 inches in the order of 22 to 30 lbs. per cubic foot.
Claim 2
Dependent Claim
152 words
A mattress made of foam having three distinct sections, said distinct sections being integral and coextensive with each other, said foam material of the first zone having a first density and compressibility factor at 4 inches in the order of 22 to 30 lbs. per cubic foot, said second zone being adjacent to said first zone and having a second density and second compressibility factor, said second zone having a first and second portion, said first portion having a compressibility factor at 4 inches in the order of 37 to 60 lbs. per cubic foot, and said third zone adjacent to said second zone and having a third density and compressibility factor at 4 inches in the order of 22 to 30 lbs. per cubic foot, and said second portion of said second zone having a compressibility factor at 4 inches in the order of 22 to 30 lbs. per cubic foot.
Claim 3
Dependent Claim
80 words
The mattress of claim 1, in which the material of first zone and third zone have identical density and compressibility factors different from that of the second zone in the order of 1.4-2.2 lbs. per cubic foot said density of said first portion of said second zone being in the order of 1.85-2.9 lbs. per cubic foot, whereby the various densities and compressibility factors of said foam cooperate to form a mattress having therapeutic supPort qualities to the users thereof.
Claim 4
Dependent Claim
152 words
A mattress made of foam having three distinct sections, said distinct sections being integral and coextensive with each other, said foam material of the first zone having a first density and compressibility factor at 4 inches in the order of 23 to 30 lbs. per cubic foot, said second zone being adjacent to said first zone and having a second density and second compressibility factor, said second zone having a first and second portion, said first portion having a compressibility factor at 4 inches in the order of 38 to 55 lbs. per cubic foot, and said third zone adjacent to said second zone and having a third density and compressibility factor at 4 inches in the order of 24 to 30 lbs. per cubic foot, and said second portion of said second zone having a compressibility factor at 4 inches in the order of 23 to 30 lbs. per cubic foot.
Claim 5
Dependent Claim
152 words
A mattress made of foam having three distinct sections, said distinct sections being integral and coextensive with each other, said foam material of the first zone having a first density and compressibility factor at 4 inches in the order of 23 to 30 lbs. per cubic foot, said second zone being adjacent to said first zone and having a second density and second compressibility factor, said second zone having a first and second portion, said first portion having a compressibility factor at 4 inches in the order of 38 to 55 lbs. per cubic foot, and said third zone adjacent to said second zone and having a third density and compressibility factor at 4 inches in the order of 24 to 30 lbs. per cubic foot, and said second portion of said second zone having a compressibility factor at 4 inches in the order of 23 to 30 lbs. per cubic foot.
Claim 6
Dependent Claim
80 words
The mattress of claim 3, in which the material of first zone and third zone have identical density and compressibility factors different from that of the second zone in the order of 1.6-1.85 lbs. per cubic foot said density of said first portion of said second zone being in the order of 2.2-2.75 lbs. per cubic foot, whereby the various densities and compressibility factors of said foam cooperate to form a mattress having therapeutic support qualities to the users thereof.
Claim 7
Dependent Claim
228 words
A mattress made of foam having three distinct sections, said distinct sections being integral and coextensive with each other, said foam material of the first zone having a first density and compressibility factor at 4 inches in the order of 23 to 29 lbs. per cubic foot, said second zone being adjacent to said first zone and having a second density and second compressibility factor, said second zone having a first and second portion said first portion having a compressibility factor at 4 inches in the order of 45 to 55 lbs. per cubic foot, and said third zone adjacent to said second zone and having a third density and compressibility factor at 4 inches in the order of 23 to 29 lbs. per cubic foot, said second portion of said second zone having a compressibility factor at 4 in the order of 23 to 29 lbs. per cubic foot, and said material of first zone and third zone having identical density and compressibility factors different from that of the second zone in the order of 1.6 to 1.75 lbs. per cubic foot, said density of said first portion of said second zone being in the order of 2.6 to 2.75 lbs. per cubic foot, whereby the various densities and compressibility factors of said foam cooperate to form a mattress having thereapeutic support qualities to the users thereof.
Claim 8
Dependent Claim
228 words
A mattress made of foam having three distinct sections, said distinct sections being integral and coextensive with each other, said foam material of the first zone having a first density and compressibility factor at 4 inches in the order of 23 to 29 lbs. per cubic foot, said second zone being adjacent to said first zone and having a second density and second compressibility factor, said second zone having a first and second portion said first portion having a compressibility factor at 4 inches in the order of 45 to 55 lbs. per cubic foot, and said third zone adjacent to said second zone and having a third density and compressibility factor at 4 inches in the order of 23 to 29 lbs. per cubic foot, said second portion of said second zone having a compressibility factor at 4 in the order of 23 to 29 lbs. per cubic foot, and said material of first zone and third zone having identical density and compressibility factors different from that of the second zone in the order of 1.6 to 1.75 lbs. per cubic foot, said density of said first portion of said second zone being in the order of 2.6 to 2.75 lbs. per cubic foot, whereby the various densities and compressibility factors of said foam cooperate to form a mattress having thereapeutic support qualities to the users thereof.
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) | 1977-11-11 | 1978-05-13 | 1978-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-11 | 1982-05-13 | 1982-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-11 | 1986-05-13 | 1986-11-12 | $7700.00 | Window Closed / Lapsed |