US4649007A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coextruded multiple plastic layer slip pallet
Assignee: Portage Industries Corp
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Filing: 1984-04-04
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Granted: 1987-03-10
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Expires: 2004-04-04
Abstract
Abstract A slip pallet made of a multiple layer coextruded sheet, one layer having more shrinkage than a layer below it to provide a natural curl to a gripping edge portion of the sheet such that in use the gripping edge portion is accessible by a gripper of a forklift.
Inventors
- 👤 Laszlo J. Bonis
- 👤 George V. Courville
- 👤 Samuel Opland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:28
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B29; B29C; B29C48/00; B29C48/001; B29C48/0022; B29C48/03; B29C48/07; B29C48/08; B29C48/16; B29C48/18; B29C48/21; B29C48/25; B29C48/30; B29C48/305; B29C48/307; B32B27/32; B65; B65D; B65D19/00; B29C2793/00; B29C2793/0027; B29K; B29K2105/00; B29K2105/26; B29K2995/00; B29K2995/0037; B29K2995/0072; B29L; B29L2031/00; B29L2031/712; B29L2031/7178; B32B2250/00; B32B2250/04; B32B2272/00; B32B2307/00; B32B2307/70; B32B2307/732; B32B2307/734; B32B2307/736; B32B2307/744; B32B2307/746; Y; Y10; Y10S; Y10S264/00; Y10S264/71; Y10T; Y10T428/00; Y10T428/26; Y10T428/269; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31924
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
154 words
A method of making slip pallets comprising coextruding a sheet comprising a plurality of plastic layers including an upper nonslip layer of a first plastic and a lower slip layer of second plastic, the exposed upper surface of said upper nonslip layer having a coefficient of friction higher than that of an exposed lower surface of said lower slip layer, to cause said lower surface to slide relative to a platen and said upper surface to frictionally engage boxes on it, one layer of said plurality of layers having more shrinkage than a layer below said one layer to provide a natural curl to gripping edge portions of said slip pallets such that in use said gripping edge portions of said slip pallets are accessible by a gripper of a forklift, and cutting said sheet into individual slip pallets that are larger than the boxes to be supported to provide said gripping edge portions.
Claim 2
Independent Claim
154 words
A method of making slip pallets comprising coextruding a sheet comprising a plurality of plastic layers including an upper nonslip layer of a first plastic and a lower slip layer of second plastic, the exposed upper surface of said upper nonslip layer having a coefficient of friction higher than that of an exposed lower surface of said lower slip layer, to cause said lower surface to slide relative to a platen and said upper surface to frictionally engage boxes on it, one layer of said plurality of layers having more shrinkage than a layer below said one layer to provide a natural curl to gripping edge portions of said slip pallets such that in use said gripping edge portions of said slip pallets are accessible by a gripper of a forklift, and cutting said sheet into individual slip pallets that are larger than the boxes to be supported to provide said gripping edge portions.
Claim 3
Dependent Claim
11 words
The method of claim 1 wherein said second plastic comprises polyethylene.
Claim 4
Dependent Claim
31 words
The method of claim 2 wherein said first plastic comprises one of the group including ethylene-vinyl acetate copolymer, ethylene-methyl acrylate copolymer, ionomer, and scrap plastic including polyethylene and acrylonitrile containing polymer.
Claim 5
Dependent Claim
14 words
The method of claim 1 wherein said plurality of plastic layers comprises four layers.
Claim 6
Dependent Claim
74 words
The method of claim 4 wherein said first plastic in said upper nonslip layer comprises scrap plastic including polyethylene and acrylonitrile containing polymer, said second plastic in said lower slip layer comprises polyethylene, said plurality of plastic layers comprises an intermediate layer of said scrap plastic above said lower nonslip layer of polyethylene, and an intermediate layer of polyethylene above said intermediate layer of scrap plastic and below said upper layer of scrap plastic.
Claim 7
Dependent Claim
33 words
The method of claim 1 wherein said plurality of layers comprises a layer comprising one of the group of polyethylene, polypropylene, polyethylene terepthalate, glycol-modified polyethylene terepthalate, nylon, ultrahigh molecular weight polyethylene, and polycarbonate.
Claim 8
Dependent Claim
20 words
The method of claim 1 wherein said gripping edge portion has a radius of curvature between four and nine inches.
Claim 9
Dependent Claim
14 words
The method of claim 1 wherein said sheet is less than 200 mils thick.
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) | 1990-03-09 | 1990-09-08 | 1991-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-09 | 1994-09-08 | 1995-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-09 | 1998-09-08 | 1999-03-10 | $7700.00 | Window Closed / Lapsed |