US3971574A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pipe coupling
Assignee: Individual
•
Filing: 1974-12-30
•
Granted: 1976-07-27
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Expires: 1994-12-30
Abstract
Abstract A coupling for unthreaded pipes of a sprinkler system, which permits the replacement of a small damaged pipe section without bending the pipes already emplaced in the ground. One coupling includes a short pipe section having an enlaged tubular portion fixed at one end thereof adapted to be fitted over and adhered to a first open end of the pipe in the ground. A slidable sleeve on a second end of the pipe section has an enlarged tubular portion adapted to be fitted over and adhered to a second open end of the pipe in the ground.
Inventors
- 👤 Hoyt S. Curtin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:37
CPC Classifications
F; F16; F16L; F16L47/00; F16L47/02; F16L13/00; F16L13/10; F16L13/103; F16L21/00; F16L21/002; F16L21/005; Y; Y10; Y10S; Y10S285/00; Y10S285/915
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
226 words
A coupling for joining first and second pipes having open ends spaced from one another by a predetermined distance, said coupling comprising: a pipe section including an elongated portion having an outer diameter smaller than the outer diameter of said first and second pipes; said pipe section having a total length substantially equal to said predetermined distance and further including an enlarged tubular portion formed on a first end thereof, said tubular portion defining an inner surface having a diameter slightly larger than the outer diameter of said first pipe for adhesive mounting on said first pipe; and a sleeve slidable along said pipe section elongated portion having a substantially smooth internal surface including a first portion having a diameter slightly larger than the outer diameter of said pipe section elongated portion for axial sliding movement of said sleeve therealong and for adhesive mounting thereto and a second portion having a diameter slightly larger than the outer diameter of said second pipe for adhesive mounting thereto, said sleeve having a substantially smooth external surface free of securing means; said sleeve second portion internal surface being tapered such that its diameter decreases from its free end toward said sleeve first portion from a diameter slightly greater than the outer diameter of said second pipe to a diameter slightly smaller than the outer diameter of said second pipe.
Claim 2
Dependent Claim
226 words
A coupling for joining first and second pipes having open ends spaced from one another by a predetermined distance, said coupling comprising: a pipe section including an elongated portion having an outer diameter smaller than the outer diameter of said first and second pipes; said pipe section having a total length substantially equal to said predetermined distance and further including an enlarged tubular portion formed on a first end thereof, said tubular portion defining an inner surface having a diameter slightly larger than the outer diameter of said first pipe for adhesive mounting on said first pipe; and a sleeve slidable along said pipe section elongated portion having a substantially smooth internal surface including a first portion having a diameter slightly larger than the outer diameter of said pipe section elongated portion for axial sliding movement of said sleeve therealong and for adhesive mounting thereto and a second portion having a diameter slightly larger than the outer diameter of said second pipe for adhesive mounting thereto, said sleeve having a substantially smooth external surface free of securing means; said sleeve second portion internal surface being tapered such that its diameter decreases from its free end toward said sleeve first portion from a diameter slightly greater than the outer diameter of said second pipe to a diameter slightly smaller than the outer diameter of said second pipe.
Claim 3
Dependent Claim
34 words
The pipe coupling of claim 1 wherein the outer surface of said pipe section elongated portion has striations formed therein; and wherein the internal surface of said sleeve first portion has striations formed therein.
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) | 1979-07-27 | 1980-01-26 | 1980-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-27 | 1984-01-26 | 1984-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-27 | 1988-01-26 | 1988-07-27 | $7700.00 | Window Closed / Lapsed |