Patent US3706326A successfully refreshed from Google Patents.
US3706326A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexible conduit
Assignee: Individual
•
Filing: 1971-07-09
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Granted: 1972-12-19
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Expires: 1991-07-09
Abstract
Abstract Enhanced flexibility of a wear-resistantly lined conduit, reinforced by a spiroid incorporated in the structure, is accomplished by employing internally a continuous spirallyconfigured, partially unattached, supple liner serving to shield the internal peak portions of the conduit related to the spiroid from wear caused by the passage through the conduit of abrasiveparticle-laden air and other gaseous streams. Suppleness of the liner is further enhanced by dividing a trailing portion of the liner into separate leaf-like portions.
Inventors
- 👤 Richard G Bringolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:49
CPC Classifications
F; F16; F16L; F16L11/00; F16L11/24
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
94 words
In a flexible conduit of the type comprising a continuous reinforcing spiroid wrapped in a flexible covering which is secured thereto to form a tubular structure, the improvement, comprising: a spirally convoluted, non-metallic liner within said structure extending from end-to-end thereof; each convolution of said liner having a leading portion anchored within said tubular structure and a supple trailing portion extending in overlapped and unsecured relation to the leading portion of a preceding convolution of said liner; the trailing edge portion of said convoluted liner being divided into a series of separate leaf-like elements.
Claim 2
Dependent Claim
94 words
In a flexible conduit of the type comprising a continuous reinforcing spiroid wrapped in a flexible covering which is secured thereto to form a tubular structure, the improvement, comprising: a spirally convoluted, non-metallic liner within said structure extending from end-to-end thereof; each convolution of said liner having a leading portion anchored within said tubular structure and a supple trailing portion extending in overlapped and unsecured relation to the leading portion of a preceding convolution of said liner; the trailing edge portion of said convoluted liner being divided into a series of separate leaf-like elements.
Claim 3
Dependent Claim
21 words
The improvement according to claim 1 in which the liner is a compressible ribbon having edge slits in its trailing portion.
Claim 4
Dependent Claim
19 words
The improvement according to claim 2 in which the slits between the leaf-like elements of the liner diverge rearwardly.
Claim 5
Dependent Claim
31 words
The improvement according to claim 2 in which the trailing portion of the liner is serially slit substantially normal to its edge to form a continuous series of separate leaf-like elements.
Claim 6
Dependent Claim
33 words
The improvement accorDing to claim 4 in which the leading portion of the liner is disposed outward of the convolutions of the spiroid and is pressed and held thereto by the flexible covering.
Claim 7
Dependent Claim
38 words
The improvement according to claim 1 in which the flexible covering is a spirally convoluted tape and the leading portion of the liner is disposed between the convolutions of the spiroid and the inside of said flexible covering.
Claim 8
Dependent Claim
24 words
The improvement according to claim 6 in which the leading portion of the liner is adhesively attached to the inside of said flexible covering.
Claim 9
Dependent Claim
17 words
The improvement according to claim 1 in which the inner surfaces of the leaf-like elements are armored.
Claim 10
Dependent Claim
18 words
The improvement according to claim 8 in which the leaf-like elements are armored with plates of wear-resistant material.
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) | 1975-12-19 | 1976-06-19 | 1976-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-19 | 1980-06-19 | 1980-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-19 | 1984-06-19 | 1984-12-19 | $7700.00 | Window Closed / Lapsed |