US4011652A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making a pipe coupling
Assignee: PSI PRODUCTS Inc
•
Filing: 1976-04-29
•
Granted: 1977-03-15
•
Expires: 1996-04-29
Abstract
Abstract The present invention is a method for making an electrically insulative coupling which is inserted between and coupled to two lengths of metallic pipe. The method comprises the steps of machining one end of two short sections of metallic pipe to provide a circumferential groove, inserting O rings onto the grooves, inserting the machined ends of the pipe sections into a central sleeve, injection moulding an outer insulative sleeve over the machined pipe ends and central sleeve, and pressing a metal outer sleeve over the outer insulative sleeve. By this method the electrically insulative coupling is manufactured quickly and inexpensively.
Inventors
- 👤 Bobby E. Black
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:07
CPC Classifications
B; B23; B23P; B23P11/00; F; F16; F16L; F16L25/00; F16L25/02; F16L25/021; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49879; Y10T29/49885; Y10T29/49888; Y10T29/49908; Y10T29/49925; Y10T29/49927; Y10T29/49945
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
70 words
A method for making an insulative pipe coupling comprising the steps of: forming an o-ring circumferential groove adjacent the end of two pipe stubs; inserting an o-ring onto each of said grooves; inserting said pipe stub ends with said o-ring into a center insulating sleeve; injection moulding an outer insulative sleeve over said center sleeve and said pipe ends; and pressing a metal outer sleeve onto said outer insulative sleeve.
Claim 2
Independent Claim
70 words
A method for making an insulative pipe coupling comprising the steps of: forming an o-ring circumferential groove adjacent the end of two pipe stubs; inserting an o-ring onto each of said grooves; inserting said pipe stub ends with said o-ring into a center insulating sleeve; injection moulding an outer insulative sleeve over said center sleeve and said pipe ends; and pressing a metal outer sleeve onto said outer insulative sleeve.
Claim 3
Dependent Claim
36 words
A method for making a pipe coupling according to claim 1 further comprising the step of crimping the ends of said metal outer sleeve thereby preventing said outer sleeve from slipping off said outer, insulative sleeve.
Claim 4
Dependent Claim
50 words
A method for making a pipe coupling according to claim 2 further comprising the step of forming a plurality of circumferential grooves in said pipe stubs subjacent said outer insulating sleeve whereby said pipe stubs cannot be pulled out of said outer insulative sleeve without destroying said outer insulative sleeve.
Claim 5
Dependent Claim
22 words
A method for making a pipe coupling according to claim 2 further comprising the step of injection moulding said center, insulative sleeve.
Claim 6
Dependent Claim
26 words
A method for making a pipe coupling according to claim 4 wherein said outer and inner insulative sleeves are injection moulded from an electrically non-conductive plastic.
Claim 7
Dependent Claim
18 words
A method for making a pipe coupling according to claim 5 wherein said electrically non-conductive plastic is polyterephthalate.
Claim 8
Dependent Claim
24 words
A method for making a pipe coupling according to claim 1 further comprising the step of swedging the ends of said metal outer sleeve.
Claim 9
Dependent Claim
24 words
A method for making a pipe coupling according to claim 1 further comprising the step of curling the ends of said metal outer sleeve.
Claim 10
Dependent Claim
33 words
A method for making a pipe coupling according to claim 2 wherein said ends of said outer metal sleeve are crimped while said metal outer sleeve is pressed onto said outer insulative sleeve.
References Cited (Backward Citations)
US2716623A
Cited
US3284110A
Cited
US3432186A
Cited
US3434900A
Cited
US3892032A
Cited
US3871687A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-03-14 | 1980-09-13 | 1981-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-14 | 1984-09-13 | 1985-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-14 | 1988-09-13 | 1989-03-15 | $7700.00 | Window Closed / Lapsed |