US4093482A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat and sound insulator of curved corrugated paperboard and method of shaping same
Assignee: Nissan Motor Co Ltd
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Filing: 1976-05-14
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Granted: 1978-06-06
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Expires: 1996-05-14
Abstract
Abstract A plane plate of corrugated paperboard, which is produced by bonding a corrugated medium and at least one liner board with a thermoplastic resin, is shaped into a curved plate by means of a hot-press so that the resin fluidifies and allows the medium and each liner board to make individual and slipping movements during press-forming. The resin hardens upon subsequent temperature reduction and affords the curved heat and sound insulator plate a good shape retentivity.
Inventors
- 👤 Mitsutoshi Ogata
- 👤 Norinao Naito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 02:56
CPC Classifications
B; B29; B29C; B29C70/00; B29C70/04; B29C70/28; B29C70/40; B29C70/42; B29C70/46; B29C53/00; B29C53/02; B29C53/04; B29D; B29D24/00; B29D24/002; B32; B32B; B32B1/00; B32B27/00; B32B27/06; B32B27/10; B32B29/00; B32B29/08; B32B37/00; B32B37/14; B32B37/146; B32B38/00; B32B38/18; B32B38/1866; B60; B60R; B60R13/00; B60R13/02; B60R13/0212; B60R13/0225; B63; B63B; B63B3/00; B63B3/14; B63B3/68; E; E04; E04C; E04C2/00; E04C2/30; E04C2/32; E04C2/322; B29K; B29K2313/00; B29K2995/00; B29K2995/0001; B29K2995/0002; B29K2995/0012; B29K2995/0015; B29L; B29L2024/00; B29L2024/003; B32B2307/00; B32B2307/10; B32B2307/102; B32B2307/30; B32B2307/304; B32B2605/00; B32B2605/003; B32B2607/00; B60R13/08; B60R13/0815; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1025; Y10T428/00; Y10T428/24; Y10T428/24628; Y10T428/24669; Y10T428/24694; Y10T428/24711; Y10T428/24727
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
190 words
A method of shaping a heat and sound insulating plate member of corrugated paperboard to form a plate member having at least one permanently curved portion, the method comprising the steps of: preparing a plane composite plate by joining a sheet of plane liner paper to a corrugated medium of paper by a thermoplastic resin such that a layer of said resin in hardened state adheres both to said corrugated medium at respective top regions of parallel ridges thereof and to the inside surface of said plane liner; press-forming said plane composite plate into a desired shape having at least one permanently curved portion with application of heat to said layer from the outside of said liner and said corrugated medium such that the temperature of said layer is maintained above the softening point of said resin and that said resin fluidifies and permits said liner and said corrugated medium to compensate for relative displacement during the forming; and lowering the temperature to harden said layer in the shaped plate member whereby the shaped plate member is free from such internal strains as cause spontaneous deformation of the plate member.
Claim 2
Independent Claim
190 words
A method of shaping a heat and sound insulating plate member of corrugated paperboard to form a plate member having at least one permanently curved portion, the method comprising the steps of: preparing a plane composite plate by joining a sheet of plane liner paper to a corrugated medium of paper by a thermoplastic resin such that a layer of said resin in hardened state adheres both to said corrugated medium at respective top regions of parallel ridges thereof and to the inside surface of said plane liner; press-forming said plane composite plate into a desired shape having at least one permanently curved portion with application of heat to said layer from the outside of said liner and said corrugated medium such that the temperature of said layer is maintained above the softening point of said resin and that said resin fluidifies and permits said liner and said corrugated medium to compensate for relative displacement during the forming; and lowering the temperature to harden said layer in the shaped plate member whereby the shaped plate member is free from such internal strains as cause spontaneous deformation of the plate member.
Claim 3
Dependent Claim
67 words
A method as claimed in claim 1 wherein the firstly stated step includes an additional step of joining another sheet of plane liner of paper to said corrugated medium by said thermoplastic resin such that another layer of said resin in hardened state adheres both to said corrugated medium at respective top regions of parallel ridges thereof and to the inside surface of said another plane liner.
Claim 4
Dependent Claim
33 words
A method as claimed in claim 1 further comprising the step of adhering an at least partly curved liner to said shaped plate member to cover the exposed side of said corrugated medium.
Claim 5
Dependent Claim
36 words
A method as claimed in claim 1 wherein said layer is formed by initially coating one side of said plane liner with said thermoplastic resin and then making the coated resin adhere to said corrugated medium.
Claim 6
Dependent Claim
42 words
A method as claimed in claim 1 wherein said layer is formed by initially coating said one side of said corrugated medium with said thermoplastic resin and then causing the coated resin to adhere to said inside surface of said plane liner.
Claim 7
Dependent Claim
31 words
A method as claimed in claim 1 wherein said thermoplastic resin is selected from the group consisting of polyethylene, polypropylene, polyvinyl chloride, polyvinyl acetate, polystyrene, ethylene-propylene copolymers and ethylene-vinyl actate copolymers.
References Cited (Backward Citations)
US563775A
Cited
US3518142A
Cited
US3530021A
Cited
US3673034A
Cited
US3723222A
Cited
US3920496A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-06-05 | 1981-12-05 | 1982-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-05 | 1985-12-05 | 1986-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-05 | 1989-12-05 | 1990-06-06 | $7700.00 | Window Closed / Lapsed |