US3794364A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Conduit end connection
Assignee: Johns Manville Corp
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Filing: 1971-12-27
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Granted: 1974-02-26
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Expires: 1991-12-27
Abstract
Abstract A method of reforming one end of a length of helically corrugated sheet metal conduit by providing a tapered crimp so that said end is adapted to be lockingly received into an unreformed end of another length of like conduit for establishing an axial connection therebetween.
Inventors
- 👤 F Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:41
CPC Classifications
F; F16; F16L; F16L15/00; F16L15/005; Y; Y10; Y10S; Y10S285/00; Y10S285/903; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49373; Y10T29/49826; Y10T29/49885
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
146 words
A length of metal conduit comprising: a helically corrugated tubular wall having a generally round transverse cross-section and a uniform mean diameter for a major longitudinal extent thereof, a first end portion of said tubular wall having a diameter substantially equal to the mean diameter of the tubular wall, a second end portion of said tubular wall having partially collapsed external helical corrugations thereon, said second end portion having a reduced mean diameter relative to the mean diameter of the tubular wall and said second end portion being tapered with the diameter of said second end portion diminishing toward an extremity of said second end portion whereby said second end portion is adapted to be inserted into a first end portion of another length of similar conduit and turned therein for causing threading engagement with helical corrugations of the similar conduit to establish a connection therebetween.
Claim 2
Dependent Claim
146 words
A length of metal conduit comprising: a helically corrugated tubular wall having a generally round transverse cross-section and a uniform mean diameter for a major longitudinal extent thereof, a first end portion of said tubular wall having a diameter substantially equal to the mean diameter of the tubular wall, a second end portion of said tubular wall having partially collapsed external helical corrugations thereon, said second end portion having a reduced mean diameter relative to the mean diameter of the tubular wall and said second end portion being tapered with the diameter of said second end portion diminishing toward an extremity of said second end portion whereby said second end portion is adapted to be inserted into a first end portion of another length of similar conduit and turned therein for causing threading engagement with helical corrugations of the similar conduit to establish a connection therebetween.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-25 | 1977-08-27 | 1978-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-25 | 1981-08-27 | 1982-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-25 | 1985-08-27 | 1986-02-26 | $7700.00 | Window Closed / Lapsed |