Patent US4603445A successfully refreshed from Google Patents.
US4603445A
Expired / Lapsed
US
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Support pad and method of manufacture
Assignee: Span America Medical Systems Inc
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Filing: 1983-09-09
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Granted: 1986-08-05
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Expires: 2003-09-09
Abstract
Abstract A unitary support pad constructed of synthetic foam is described especially for use as a mattress pad for hospital patients. The pad has a number of discrete upstanding projections being independently compressible and formed in the pad so as to provide a generally flat surface with voids between the projections, preferably extending entirely through the pad, formed by compressing the foam, in discrete areas, which is severed as through the action of a transverse band saw while compressed.
Inventors
- 👤 Donald C. Spann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:42
CPC Classifications
A; A47; A47C; A47C27/00; A47C27/14; A47C27/142; A47C27/146; A61; A61G; A61G7/00; A61G7/05; A61G7/057; A61G7/05707; B; B26; B26D; B26D3/00; B26D3/28; B26D3/281; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49799; Y10T428/00; Y10T428/24; Y10T428/24273; Y10T428/24479; Y10T428/24496; Y10T428/24504; Y10T428/24512; Y10T83/00; Y10T83/02; Y10T83/0267; Y10T83/0274; Y10T83/04; Y10T83/0405; Y10T83/0419; Y10T83/0429; Y10T83/343
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
135 words
A foam pad, comprising: a foam block having upper and lower surfaces; a plurality of upstanding four-sided projections integrally associated in checkerboard patterns on both of said surfaces of said block, and having planar apex surfaces; a generally flat surface on at least one surface of said block, said flat surface being defined by said planar apex surfaces; a plurality of generally four-sided voids, defined by said block, on each side of a plurality of said projections and extending completely through said block; connecting foam portions integrally joining corners of said projections, at points thereof beneath said flat surface, to corners of adjacent projections; and said projections having planar sidewalls slightly slanted from being perpendicular to said flat surface, and said connecting foam portions having quadralateral cross-sections in a plane perpendicular to said flat surface.
Claim 2
Dependent Claim
135 words
A foam pad, comprising: a foam block having upper and lower surfaces; a plurality of upstanding four-sided projections integrally associated in checkerboard patterns on both of said surfaces of said block, and having planar apex surfaces; a generally flat surface on at least one surface of said block, said flat surface being defined by said planar apex surfaces; a plurality of generally four-sided voids, defined by said block, on each side of a plurality of said projections and extending completely through said block; connecting foam portions integrally joining corners of said projections, at points thereof beneath said flat surface, to corners of adjacent projections; and said projections having planar sidewalls slightly slanted from being perpendicular to said flat surface, and said connecting foam portions having quadralateral cross-sections in a plane perpendicular to said flat surface.
Claim 3
Dependent Claim
48 words
A foam pad as in claim 1, wherein: said plurality of voids extend completely through said block in a generally central area thereof; and said foam pad further defines integral with a marginal portion thereof a plurality of partial voids which do not extend completely through said block.
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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) | 1989-08-04 | 1990-02-03 | 1990-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-04 | 1994-02-03 | 1994-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-04 | 1998-02-03 | 1998-08-05 | $7700.00 | Window Closed / Lapsed |