US4296950A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrosion resistant pipe joint
Assignee: Dresser Industries Inc
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Filing: 1979-07-18
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Granted: 1981-10-27
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Expires: 1999-07-18
Abstract
Abstract Pipe joint components such as a metallic sleeve and companion nut of a compression-type pipe coupling are externally coated with a corrosion-resistant polymeric plastic. In a preferred embodiment the coating on the female of the components extends as a flexible skirt beyond the mating end face thereof to include an internally integral annular O-ring formation. The coating on the male fitting terminates behind the threads thereof in an annular ramp or boss adapted in assembly to be engaged by the O-ring coating formation of the female fitting. Cooperation of the engaging O-ring and ramp effects a moisture seal relation thereat.
Inventors
- 👤 Richard L. Chamberlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:40
CPC Classifications
F; F16; F16L; F16L58/00; F16L58/18; F16L58/184
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
192 words
In pipe joint forming members including a first metal component having a male thread and a second metal component having a female thread, corrosion protection for the joint adapted to be provided by said components and comprising in combination: (a) a first polymeric plastic coating formed about the periphery of said male threaded component and terminating behind the thread thereof; (b) a second polymeric plastic coating formed about the periphery of said female threaded component and terminating in an annular flexible skirt extending beyond the joint forming end thereof, said skirt being adapted when said male and female components are threadedly assembled in joint formation to surroundingly overlap a portion of the coating on said male component; and (c) at least one polymeric plastic annular lip of locally beaded cross-section integrally formed extending radially inward on an opposing surface of at least one of said overlapped skirt or coating thereat; (d) said lip being adapted to cooperate with said opposing surface at any longitudinal location along the mutual overlap therebetween in the course of assembling said components to effect a threadlessly compressive sealing engagement enclosing the metal threads of the joint formation.
Claim 2
Dependent Claim
192 words
In pipe joint forming members including a first metal component having a male thread and a second metal component having a female thread, corrosion protection for the joint adapted to be provided by said components and comprising in combination: (a) a first polymeric plastic coating formed about the periphery of said male threaded component and terminating behind the thread thereof; (b) a second polymeric plastic coating formed about the periphery of said female threaded component and terminating in an annular flexible skirt extending beyond the joint forming end thereof, said skirt being adapted when said male and female components are threadedly assembled in joint formation to surroundingly overlap a portion of the coating on said male component; and (c) at least one polymeric plastic annular lip of locally beaded cross-section integrally formed extending radially inward on an opposing surface of at least one of said overlapped skirt or coating thereat; (d) said lip being adapted to cooperate with said opposing surface at any longitudinal location along the mutual overlap therebetween in the course of assembling said components to effect a threadlessly compressive sealing engagement enclosing the metal threads of the joint formation.
Claim 3
Dependent Claim
43 words
In pipe joint forming members according to claim 1 in which said annular lip is contained on one of said opposing surfaces and the other of said opposing surfaces comprises an annular frusto-conical ramp engageable by said lip in said assembled joint formation.
Claim 4
Dependent Claim
36 words
In pipe joint forming members according to claim 2 in which said annular lip is contained about the internal surface of said skirt and said overlapped coating of said male threaded component comprises said annular ramp.
Claim 5
Dependent Claim
22 words
In pipe joint forming members according to claim 1 in which said opposing surface on which said lip is formed is ramped.
Claim 6
Dependent Claim
30 words
In pipe joint forming members according to claim 4 in which said ramped surface includes two of said at least one annular lip longitudinally spaced apart on said ramped surface.
Claim 7
Dependent Claim
25 words
In pipe joint forming members according to claims 1, 2, 3, 4 or 5 in which said pipe joint forming members comprise a compression-type coupling.
Claim 8
Dependent Claim
48 words
In pipe joint forming members according to claim 6 in which said second polymeric plastic coating formed on said female threaded component includes a second annular flexible skirt at the end opposite said first recited skirt and extending in a direction away from the joint forming end thereof.
Claim 9
Dependent Claim
50 words
In pipe joint forming members according to claim 7 in which said second annular skirt includes at least one polymeric plastic annular lip integrally formed radially inward about the internal surface thereof and adapted to sealingly engage a received pipe wall surface thereat of a pipe section to be jointed.
References Cited (Backward Citations)
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GB1080305A
Cited
GB1175182A
Cited
US3380763A
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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) | 1984-10-26 | 1985-04-27 | 1985-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-26 | 1989-04-27 | 1989-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-26 | 1993-04-27 | 1993-10-27 | $7700.00 | Window Closed / Lapsed |