Patent US3755038A successfully refreshed from Google Patents.
US3755038A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making structural material
Assignee: Individual
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Filing: 1971-05-12
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Granted: 1973-08-28
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Expires: 1991-05-12
Abstract
Abstract The specification describes the preparation of a structural material which consists of a filling of substantially sinusoidally curved strips of sheet material, sandwiched between layers of sheet material, and bonded to these outer layers. The material may be in the form of a single or multi-layer sandwich and is made using at least one rotating member having formers projecting therefrom to deform initially parallel strips into substantially sinusoidal conformation.
Inventors
- 👤 S Atteck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:25
CPC Classifications
B; B32; B32B; B32B21/00; B32B21/04; B32B21/06; E; E04; E04C; E04C2/00; E04C2/30; E04C2/34; E04C2/36; B32B21/042; B32B2607/00; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1003; Y10T156/1025; Y10T428/00; Y10T428/24; Y10T428/24149; Y10T428/24157
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
236 words
A method of making structural material in a form of a sandwich comprising at least two substantially parallel layers of sheet material, and a filling between adjacent layers of strips of sheet material, arranged so that widths of the strips are substantially perpendicular to said parallel layers, the method comprising: a. providing at least one rotatable member having a plurality of formers fixed to and projecting therefrom, said formers being arranged in substantially parallel rows on said rotating member, the formers of each row being in staggered relationship to the formers in the row immediately adjacent said firstmentioned row, b. rotating said member in a fixed direction transverse to said rows. c. providing a plurality of strips of sheet material in line abreast, each strip being on edge and parallel to the other said strips with the faces of adjacent strips facing each other, d. feeding said strips lengthwise substantially into contiguity with said rotatable member in a direction corresponding to said fixed direction, whereby said faces of said strips are fed into contact with said formers and said strips are passed between said formers and whereby said strips are bent into substantially sinusoidal curves, the curves of adjacent strips being out of phase so as to abut at intervals therealong, and e. bonding layers of sheet material to the exposed sinusoidally disposed edges of said strips, whereby a structural material of sandwich construction is formed,
Claim 2
Independent Claim
236 words
A method of making structural material in a form of a sandwich comprising at least two substantially parallel layers of sheet material, and a filling between adjacent layers of strips of sheet material, arranged so that widths of the strips are substantially perpendicular to said parallel layers, the method comprising: a. providing at least one rotatable member having a plurality of formers fixed to and projecting therefrom, said formers being arranged in substantially parallel rows on said rotating member, the formers of each row being in staggered relationship to the formers in the row immediately adjacent said firstmentioned row, b. rotating said member in a fixed direction transverse to said rows. c. providing a plurality of strips of sheet material in line abreast, each strip being on edge and parallel to the other said strips with the faces of adjacent strips facing each other, d. feeding said strips lengthwise substantially into contiguity with said rotatable member in a direction corresponding to said fixed direction, whereby said faces of said strips are fed into contact with said formers and said strips are passed between said formers and whereby said strips are bent into substantially sinusoidal curves, the curves of adjacent strips being out of phase so as to abut at intervals therealong, and e. bonding layers of sheet material to the exposed sinusoidally disposed edges of said strips, whereby a structural material of sandwich construction is formed,
Claim 3
Dependent Claim
23 words
A method according to claim 1 comprising feeding the strips of sheet material into the nip provided by a pair of rotatable members.
Claim 4
Dependent Claim
20 words
A method according to claim 2 comprising providing a pair of rotatable members each having projecting formers of domed shape.
Claim 5
Dependent Claim
37 words
A method according to claim 3 wherein the domed formers are of non-circular cross-section, the greatest cross-sectional dimension being along an axis parallel to the direction of feed of the strips of sheet material into the nip.
Claim 6
Dependent Claim
24 words
A method according to claim 2 comprising applying adhesive to the sinusoidally formed strips before bonding the layers of sheet material to the strips.
Claim 7
Dependent Claim
27 words
A method according to claim 5 comprising applying a curable adhesive to the strips and passing the sandwich material through a heating station to cure the adhesive.
Claim 8
Dependent Claim
12 words
A method according to claim 2 wherein the strips are of wood.
Claim 9
Dependent Claim
12 words
A method according to claim 2 wherein the strips are of cardboard.
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) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |