Patent US3913622A successfully refreshed from Google Patents.
US3913622A
Expired / Lapsed
US
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Gas conduit and method of making same
Assignee: Dayco Products LLC
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Filing: 1973-10-19
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Granted: 1975-10-21
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Expires: 1993-10-19
Abstract
Abstract A gas conduit and method of making the same is provided wherein the conduit has a plurality of axially spaced convolutions defined as an integral part thereof and has a roughened interior surface defined by a plurality of substantially axially extending grooves in the conduit. The roughened interior surface is particularly adapted to provide quieter gas flow through the conduit by breaking up gas flow patterns caused by the convolutions and which patterns would ordinarily tend to produce undesirable noise levels and chiming.
Inventors
- 👤 Homer N Holden
- 👤 Morris Shokler
- 👤 Sidney K Lamden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:57
CPC Classifications
B; B29; B29C; B29C49/00; B29C49/0015; B29C49/0021; F; F16; F16L; F16L11/00; F16L11/04; F16L11/11; F16L11/111; B29C2791/00; B29C2791/004; B29C2791/006; B29C49/42; B29C49/42412; B29L; B29L2023/00; B29L2023/18
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
91 words
A flexible conduit composed of a single elastomeric tubular member having a smooth continuous outer surface and a roughened inner surface; said conduit having external and internal convolutions comprising alternating crests and troughs, the crests and troughs of the outer surface corresponding to the troughs and crests of the inner surface; said inner surface characterized by a plurality of substantially axially extending grooves; said conduit having a substantially uniform wall thickness, said grooves extending into said inner surface in an amount constituting only a small fractional portion of said wall thickness.
Claim 2
Dependent Claim
91 words
A flexible conduit composed of a single elastomeric tubular member having a smooth continuous outer surface and a roughened inner surface; said conduit having external and internal convolutions comprising alternating crests and troughs, the crests and troughs of the outer surface corresponding to the troughs and crests of the inner surface; said inner surface characterized by a plurality of substantially axially extending grooves; said conduit having a substantially uniform wall thickness, said grooves extending into said inner surface in an amount constituting only a small fractional portion of said wall thickness.
Claim 3
Dependent Claim
11 words
The conduit of claim 1 in which said convolutions are annular.
Claim 4
Dependent Claim
11 words
The conduit of claim 1 in which said convolutions are helical.
Claim 5
Dependent Claim
22 words
The conduit of claim 1 in which the depth of said grooves is approximately one-twentieth of the depth of said wall thickness.
Claim 6
Dependent Claim
15 words
The conduit of claim 1 in which said grooves are arranged in a random manner.
Claim 7
Dependent Claim
16 words
The conduit of claim 1 in which said grooves are located primarily on said internal crests.
Claim 8
Dependent Claim
17 words
The conduit of claim 1 in which said grooves are located on practically the entire inner surface.
References Cited (Backward Citations)
US713560A
Cited
US2029424A
Cited
US3374856A
Cited
US3731711A
Cited
US3640312A
Cited
US3605817A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-20 | 1979-04-21 | 1979-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-20 | 1983-04-21 | 1983-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-20 | 1987-04-21 | 1987-10-21 | $7700.00 | Window Closed / Lapsed |