US3899805A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Indented sheet
Assignee: Dow Chemical Co
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Filing: 1973-07-13
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Granted: 1975-08-19
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Expires: 1993-07-13
Abstract
Abstract Indented sheet structure is disclosed which describes a surface of repeating hollow projections, and repeating pocket areas or valleys, at least certain of the pocket areas having a restricted neck opening defined by the side profile(s) of projection(s) in adjacent positioning thereto. Like sheets are interdigitatable, in which posture, the projections snap fit into the restricted pocket areas of the opposite sheet, to mechanically interlock the sheets at a multiplicity of distributed points.
Inventors
- 👤 William J Mcmillan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:58
CPC Classifications
A; A44; A44B; A44B18/00; A44B18/0046; A44B18/0053; B; B32; B32B; B32B3/00; B32B3/26; B32B3/28; B32B3/02; B32B3/06; E; E04; E04C; E04C2/00; E04C2/30; E04C2/32; B32B2250/00; B32B2250/40; Y; Y10; Y10S; Y10S24/00; Y10S24/30; Y10S24/38; Y10T; Y10T24/00; Y10T24/45; Y10T24/45152; Y10T428/00; Y10T428/24; Y10T428/24008; Y10T428/24355; Y10T428/24628; Y10T428/24661
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
97 words
An indented sheet describing at a surface portion thereof, repeating, regularly distributed, hollow projections, a like distribution of repeating pocket areas, at least certain of such projections including enlarged head portions, respectively, restricted neck regions defined in said pocket areas through means of said enlarged heat portions, said enlarged heat portions comprising cap elements affixed to said projections, such indented sheet being comprised of sufficiently resilient material for deformable, resilient passage of such enlarged heat portions by a like-sized restricted neck region for purpose of interlocking such surface portion to a like surface or the equivalent thereof.
Claim 2
Dependent Claim
97 words
An indented sheet describing at a surface portion thereof, repeating, regularly distributed, hollow projections, a like distribution of repeating pocket areas, at least certain of such projections including enlarged head portions, respectively, restricted neck regions defined in said pocket areas through means of said enlarged heat portions, said enlarged heat portions comprising cap elements affixed to said projections, such indented sheet being comprised of sufficiently resilient material for deformable, resilient passage of such enlarged heat portions by a like-sized restricted neck region for purpose of interlocking such surface portion to a like surface or the equivalent thereof.
Claim 3
Dependent Claim
20 words
The indented sheet of claim 1 wherein said pocket areas are of generally inverted configuration and size to the projections.
Claim 4
Dependent Claim
17 words
The indented sheet of claim 2 wherein said projections taper away from the plane of the sheet.
Claim 5
Dependent Claim
101 words
An indented sheet structure describing along a surface portion thereof the combination comprising a multi-linear pattern of hollow projections, a like pattern of repeating pocket areas, such patterns being out of phase so that said surface portion is interdigitable with a like surface, at least certain of said projections having cap elements affixed thereto and defining restricted neck regions in said pocket areas, said indented sheet being comprised of sufficiently resilient material for deformable, resilient passage of such cap elements by a like-sized restricted neck region for purpose of interlocking such surface portion with a like surface or the equivalent thereof.
Claim 6
Dependent Claim
101 words
An indented sheet structure describing along a surface portion thereof the combination comprising a multi-linear pattern of hollow projections, a like pattern of repeating pocket areas, such patterns being out of phase so that said surface portion is interdigitable with a like surface, at least certain of said projections having cap elements affixed thereto and defining restricted neck regions in said pocket areas, said indented sheet being comprised of sufficiently resilient material for deformable, resilient passage of such cap elements by a like-sized restricted neck region for purpose of interlocking such surface portion with a like surface or the equivalent thereof.
Claim 7
Dependent Claim
17 words
The indented sheet of claim 4 wherein said projections taper away from the plane of the sheet.
Claim 8
Dependent Claim
20 words
The indented sheet of claim 5 wherein said pocket areas are of generally inverted size and configuration to said projections.
Claim 9
Dependent Claim
14 words
The indented sheet of claim 6 wherein said projections are generally pyramidal in shape.
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) | 1978-08-18 | 1979-02-17 | 1979-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-18 | 1983-02-17 | 1983-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-18 | 1987-02-17 | 1987-08-19 | $7700.00 | Window Closed / Lapsed |