US3676918A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making structural element
Assignee: Individual
•
Filing: 1970-01-28
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Granted: 1972-07-18
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Expires: 1990-01-28
Abstract
Abstract A hollow structural element and a method of making the same are disclosed. The structural element is bounded by outer peripheral walls at least some of which are provided with coupling elements. It consists of a plurality of discrete sections which together have the configuration of the completed hollow structural element, and which are assembled and connected with one another, releasably or non-releasably, so as together have the configuration of the structural element.
Inventors
- 👤 Artur Fischer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:22
CPC Classifications
A; A63; A63H; A63H33/00; A63H33/04; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49863; Y10T29/49876
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
165 words
A method of making a composite hollow structural element of at least substantially quadratic cross-section and having an annular circumferential wall which is composed of a pair of circumferentially successive wall sections at least some of which are provided with coupling elements, comprising the steps of forming by injection-molding a one-piece blank resembling in configuration a development of said annular circumferential wall and including said wall sections each of which comprises two portions located in mutually inclined planes and respectIvely corresponding to adjacent side walls of said structural element, one portion of each section being connected with one portion of the other section along adjacent edges by a thin web, and the other portion of each section having respective free edges extending in at least substantial parallelism with said adjacent edges; thereupon displacing said sections relative to one another by folding them at said web until said free edges abut; and connecting said other portions with one another in the region of said free edges.
Claim 2
Independent Claim
165 words
A method of making a composite hollow structural element of at least substantially quadratic cross-section and having an annular circumferential wall which is composed of a pair of circumferentially successive wall sections at least some of which are provided with coupling elements, comprising the steps of forming by injection-molding a one-piece blank resembling in configuration a development of said annular circumferential wall and including said wall sections each of which comprises two portions located in mutually inclined planes and respectIvely corresponding to adjacent side walls of said structural element, one portion of each section being connected with one portion of the other section along adjacent edges by a thin web, and the other portion of each section having respective free edges extending in at least substantial parallelism with said adjacent edges; thereupon displacing said sections relative to one another by folding them at said web until said free edges abut; and connecting said other portions with one another in the region of said free edges.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |