US3604465A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pipe construction
Assignee: Basler Stueckfaerberei AG
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Filing: 1968-03-06
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Granted: 1971-09-14
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Expires: 1988-03-06
Abstract
Abstract A pipe construction includes a plastic bonded filling material wherein at least one constituent of the filling material is varied in amount in a radial direction over at least a part of the pipe wall thickness. The pipe is made by supplying a filling material to a rotating mold in successive strokes along the mold axis in addition to a plastic material which is supplied continuously to the mold; and varying at least one constituent of the filling material during at least some of successive strokes as the wall thickness of the pipe is being formed.
Inventors
- 👤 Rudolf Schetty
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:31
CPC Classifications
F; F16; F16L; F16L59/00; F16L59/10; B; B29; B29C; B29C41/00; B29C41/003; B29C41/02; B29C41/04; B29C41/042; B29C67/00; B29C67/24; B29C67/242; B29C67/243; B29C70/00; B29C70/02; B29C70/021; B29C70/025; F16L9/00; F16L9/12; F16L9/121; B29C2791/00; B29C2791/001; B29K; B29K2105/00; B29K2105/06; B29K2105/12; B29K2105/16; B29K2309/00; B29K2309/08; B29K2709/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
78 words
A pipe construction particularly an underground pipe such as a sewer pipe, comprising a cylindrical wall of plastic material bonded over a filler material, said cylindrical wall having a longitudinal axis with a radially inner wall interior and a radially outer wall exterior and a wall center midway between said interior and exterior, the quantity of filler material throughout the length of said pipe varying continuously throughout the radial thickness from said wall interior to said wall exterior.
Claim 2
Dependent Claim
78 words
A pipe construction particularly an underground pipe such as a sewer pipe, comprising a cylindrical wall of plastic material bonded over a filler material, said cylindrical wall having a longitudinal axis with a radially inner wall interior and a radially outer wall exterior and a wall center midway between said interior and exterior, the quantity of filler material throughout the length of said pipe varying continuously throughout the radial thickness from said wall interior to said wall exterior.
Claim 3
Dependent Claim
30 words
A pipe construction according to claim 1, wherein the filler material proportion varies from a minimum at the center of the wall to a maximum toward the exterior and interior.
Claim 4
Dependent Claim
26 words
A pipe construction according to claim 2, wherein said filler material varies from a maximum at the center toward a minimum at the interior and exterior.
Claim 5
Dependent Claim
26 words
A pipe construction according to claim 1, wherein the quantity of the filler material varies uniformly from one side of the wall thickness to the other.
Claim 6
Dependent Claim
15 words
A pipe construction according to claim 1, wherein the filler material comprises a pulverant material.
Claim 7
Dependent Claim
15 words
A pipe construction according to claim 1, wherein the Filler material comprises a fibrous filler.
Claim 8
Dependent Claim
35 words
A pipe construction according to claim 1, wherein said filler material comprises a pulverant filler and a fibrous filler and wherein at least one of said fillers is varied in quantity throughout the wall thickness.
Claim 9
Dependent Claim
15 words
A pipe construction according to claim 1, wherein said filler material comprises a glass fiber.
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) | 1974-09-13 | 1975-03-15 | 1975-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-13 | 1979-03-15 | 1979-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-13 | 1983-03-15 | 1983-09-14 | $7700.00 | Window Closed / Lapsed |