US4037626A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High strength composite pipe structure having leakproof joints
Assignee: BP Corp North America Inc
•
Filing: 1975-09-15
•
Granted: 1977-07-26
•
Expires: 1995-09-15
Abstract
Abstract An improved plastic composite pipe structure includes an outer corrugated pipe, an inner smooth-walled liner, and joining means including a bell fitting at one end of the liner extending beyond the outer corrugated pipe and a spigot fitting at the other end. The corrugations of the outer pipe at the spigot end are undercut so as to slide over and provide crush resistance to the joint that is formed when the spigot of one composite pipe section is inserted into and engaged with the bell of an adjacent composite pipe section. A seal, for example, an elastomeric gasket, solvent weld, or elastomer-based adhesive is used to provide a leakproof joint. Optionally, an outer pipe cover can be utilized as a component of the composite pipe.
Inventors
- 👤 James E. Roberts, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:09
CPC Classifications
F; F16; F16L; F16L47/00; F16L47/06; F16L9/00; F16L9/12; F16L9/127; Y; Y10; Y10S; Y10S285/00; Y10S285/903
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
161 words
A leakproof, plastic composite pipe for conveying fluids comprising: a. an outer corrugated pipe, the corrugations thereof defining an inner and an outer pipe diameter; b. a smooth-walled liner fitted within and affixed to the outer corrugated pipe at the corrugations defining the inner diameter thereof; and c. joining means for end-to-end joining of composite pipe sections comprising a bell at one end of the liner extending axially beyond the outer corrugated pipe, and a spigot at the other end of the liner coextensive with the outer corrugated pipe, the last corrugation coextensive with the spigot having a portion of the valley of the corrugation extending over the end of the spigot and adapted to slide over and cover the joint formed when the spigot of one composite pipe section is inserted into and engaged with the bell of an adjacent composite pipe section, said joining means being adapted to receive sealant means to provide a joint impervious to fluid leakage.
Claim 2
Dependent Claim
161 words
A leakproof, plastic composite pipe for conveying fluids comprising: a. an outer corrugated pipe, the corrugations thereof defining an inner and an outer pipe diameter; b. a smooth-walled liner fitted within and affixed to the outer corrugated pipe at the corrugations defining the inner diameter thereof; and c. joining means for end-to-end joining of composite pipe sections comprising a bell at one end of the liner extending axially beyond the outer corrugated pipe, and a spigot at the other end of the liner coextensive with the outer corrugated pipe, the last corrugation coextensive with the spigot having a portion of the valley of the corrugation extending over the end of the spigot and adapted to slide over and cover the joint formed when the spigot of one composite pipe section is inserted into and engaged with the bell of an adjacent composite pipe section, said joining means being adapted to receive sealant means to provide a joint impervious to fluid leakage.
Claim 3
Dependent Claim
31 words
The composite pipe of claim 1 wherein additionally a rigid, smooth-walled plastic pipe is fitted over and affixed to the outer corrugated pipe at the corrugations defining the outer diameter thereof.
Claim 4
Dependent Claim
35 words
The composite pipe of claim 1 wherein at least one pipe member is made of a thermoplastic resin selected from the group consisting of polyethylene, polypropylene, polyethylene-polypropylene copolymers, polystyrene, acrylonitrile-butadiene-styrene (ABS) terpolymer, and polyvinyl chloride.
Claim 5
Dependent Claim
35 words
The composite pipe of claim 2 wherein at least one pipe member is made of a thermoplastic resin selected from the group consisting of polyethylene, polypropylene, polyethylene-polypropylene copolymers, polystyrene, acrylonitrile-butadiene-styrene (ABS) terpolymer, and polyvinyl chloride.
Claim 6
Dependent Claim
20 words
The composite pipe of claim 1 wherein the sealant means is an elastomeric gasket adapted to fit over the spigot.
Claim 7
Dependent Claim
29 words
The composite pipe of claim 1 wherein the sealant means comprises a solvent weld obtained by applying a solvent for plastic to the engaging surfaces of the joining means.
Claim 8
Dependent Claim
28 words
The composite pipe of claim 1 wherein the sealant means comprises a resilient seal obtained by applying an elastomer-based adhesive to the engaging surfaces of the joining means.
References Cited (Backward Citations)
US3332446A
Cited
US3330303A
Cited
US3257719A
Cited
US3767211A
Cited
US3958425A
Cited
US3920268A
Cited
US3926222A
Cited
US3929359A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-25 | 1981-01-24 | 1981-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-25 | 1985-01-24 | 1985-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-25 | 1989-01-24 | 1989-07-26 | $7700.00 | Window Closed / Lapsed |