Patent US4267223A successfully refreshed from Google Patents.
US4267223A
Expired / Lapsed
US
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Corrugated plasticboard
Assignee: Pussikeskus Oy
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Filing: 1979-05-09
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Granted: 1981-05-12
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Expires: 1999-05-09
Abstract
Abstract Method and machine for fabricating plasticboard wherein areas of bonding are created with localized heating and pressure.
Inventors
- 👤 Henry D. Swartz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 02:03
CPC Classifications
B; B32; B32B; B32B3/00; B32B3/26; B32B3/28; B29; B29C; B29C65/00; B29C65/02; B29C65/18; B29C66/00; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/40; B29C66/41; B29C66/43; B29C66/438; B29C66/70; B29C66/73; B29C66/739; B29C66/7392; B29C66/73921; B29C66/80; B29C66/81; B29C66/814; B29C66/8141; B29C66/81427; B29C66/818; B29C66/8181; B29C66/83; B29C66/834; B29C66/8341; B29C66/83411; B29C66/8351; B29C66/83521; B32B27/00; B32B27/06; B32B27/08; B32B37/00; B32B37/14; B32B37/146; B29C66/45; B29C66/71; B29C66/81411; B29C66/81415; B29C66/81419; B29C66/81421; B29C66/81422; B29C66/83511; B29L; B29L2024/00; B29L2024/003; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24479; Y10T428/24612; Y10T428/24628; Y10T428/24669; Y10T428/24694; Y10T428/24702; Y10T428/24711; Y10T428/24727; Y10T428/24802; Y10T428/24826; Y10T428/26; Y10T428/269
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
165 words
A corrugated plasticboard having a core of corrugations which give rise to apexes, capable of being cleanly folded either parallel or transverse to said corrugations without a pressure assist bar, comprising: two face sheets separated and heat bonded to a corrugated core, wherein, on a first side of said corrugated core, a first of said two face sheets is heat bonded substantially along the complete width of apexes of said corrugated core, and wherein, on a second side of said corrugated core, a second of said two face sheets has separate heat bonds transverse to and spaced apart along substantially each apex of said corrugated core, wherein some of said heat bonds form colinear indentations transverse to a plurality of said corrugations which indentations are at such a depth that a smooth fold incorporating some of said indentations can be made by means of a flexing force about said some of said indentations without applying a pressure thereto by means of a pressure assist bar.
Claim 2
Dependent Claim
165 words
A corrugated plasticboard having a core of corrugations which give rise to apexes, capable of being cleanly folded either parallel or transverse to said corrugations without a pressure assist bar, comprising: two face sheets separated and heat bonded to a corrugated core, wherein, on a first side of said corrugated core, a first of said two face sheets is heat bonded substantially along the complete width of apexes of said corrugated core, and wherein, on a second side of said corrugated core, a second of said two face sheets has separate heat bonds transverse to and spaced apart along substantially each apex of said corrugated core, wherein some of said heat bonds form colinear indentations transverse to a plurality of said corrugations which indentations are at such a depth that a smooth fold incorporating some of said indentations can be made by means of a flexing force about said some of said indentations without applying a pressure thereto by means of a pressure assist bar.
Claim 3
Dependent Claim
17 words
The plasticboard of claim 1 wherein said facing sheets and core are made of a thermoplastic material.
Claim 4
Dependent Claim
19 words
The plasticboard of claim 2 wherein said thermoplastic material is polyethylene, polypropylene, polyvinyl chloride, polystyrene, polyesters or acrylonitrile/butadiene/styrene resins.
Claim 5
Dependent Claim
18 words
The plasticboard of claim 1 wherein said core material has a thickness in the range of 0.004-0.025 inches.
Claim 6
Dependent Claim
18 words
The plasticboard of claim 1 wherein said facing material has a thickness in the range of 0.004-0.080 inches.
References Cited (Backward Citations)
US2642372A
Cited
US2949066A
Cited
US3603219A
Cited
US3655502A
Cited
US3811987A
Cited
US3741857A
Cited
US3837973A
Cited
US3961119A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-05-11 | 1984-11-10 | 1985-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-11 | 1988-11-10 | 1989-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-11 | 1992-11-10 | 1993-05-12 | $7700.00 | Window Closed / Lapsed |