Patent US4452840A successfully refreshed from Google Patents.
US4452840A
Expired / Lapsed
US
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Plastic interlayer for lamination with heights of 10 to 500 microns
Assignee: Monsanto Japan Ltd
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Filing: 1982-02-19
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Granted: 1984-06-05
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Expires: 2002-02-19
Abstract
Abstract A plastic interlayer for lamination comprises a plastic film or sheet, at least one surface of which has a structure having many separated projections and continuous roots in the same level.
Inventors
- 👤 Takashi Sato
- 👤 Masahisa Ishikawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:48
CPC Classifications
B; B32; B32B; B32B17/00; B32B17/06; B32B17/10; B32B17/10005; B32B17/1055; B32B17/10761; B32B17/10559; B32B17/10577; B32B3/00; B32B3/26; B32B3/30; B32B2457/00; B32B2457/10; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24174; Y10T428/24182; Y10T428/24479; Y10T428/31504; Y10T428/31551; Y10T428/31627; Y10T428/3163
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
83 words
A plastic interlayer for lamination, said interlayer comprising a thermoplastic film or sheet at least one surface of which has many uniformly shaped projections: (a) at least substantially all of the projections on the surface being uniformly spaced from one another in both directions on said at least one surface; (b) both the crests and the roots of at least substantially all said projections being at the same levels; and (c) the heights of which are in a range of 10μ to 500μ.
Claim 2
Dependent Claim
83 words
A plastic interlayer for lamination, said interlayer comprising a thermoplastic film or sheet at least one surface of which has many uniformly shaped projections: (a) at least substantially all of the projections on the surface being uniformly spaced from one another in both directions on said at least one surface; (b) both the crests and the roots of at least substantially all said projections being at the same levels; and (c) the heights of which are in a range of 10μ to 500μ.
Claim 3
Dependent Claim
21 words
A plastic interlayer as recited in claim 1 wherein said plastic film or sheet is composed of a plasticized polyvinyl butyral.
Claim 4
Dependent Claim
22 words
A plastic interlayer as recited in claim 1 wherein said projections are symmetrical about axes perpendicular to said at least one surface.
Claim 5
Dependent Claim
21 words
A plastic interlayer as recited in claim 1 wherein said projections are shaped as cones, pyramids, flat-topped cones, or flat-topped pyramids.
Claim 6
Dependent Claim
20 words
A plastic interlayer as recited in claim 4 wherein said projections are shaped as tetragonal pyramids or flat-topped tetragonal pyramids.
Claim 7
Dependent Claim
18 words
A plastic interlayer as recited in claim 1 wherein the roots of said projections form a continuous lattice.
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) | 1987-06-05 | 1987-12-05 | 1988-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-05 | 1991-12-05 | 1992-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-05 | 1995-12-05 | 1996-06-05 | $7700.00 | Window Closed / Lapsed |