US3623968A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sacrificial anode and pipe protected thereby
Assignee: Tapecoat Co Inc
•
Filing: 1968-01-02
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Granted: 1971-11-30
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Expires: 1988-01-02
Abstract
Abstract A sacrificial anode and protective coating to be applied at the joints of welded sections of mill-coated pipe for the purpose of coating the exposed mill-wrap coating cutback and cathodically protecting the pipeline against corrosion especially in underground installation. The preferred anode includes a tubular shell of sacrificial anodic material electrically contacted by integral or intermediate contacts with the pipe and having a longitudinal seam for opening and closing the anode to place it around the pipe and corrosion and electrical-resistant coating material material and around the cutback. The outer surface of the anode can have a coating of a salt material suitable for forming an electrolyte with water in the surrounding soil. In a preferred and easily installable form, the anode comprises a pair of shell halves having a coating material secured to the inner surface thereof and extending longitudinally beyond the shell halves to overlap the coating material of the pipe sections at the ends of the cutback.
Inventors
- 👤 Alvin W Bohne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:06
CPC Classifications
C; C23; C23F; C23F13/00; C23F13/02; C23F13/06; C23F13/08; C23F13/10; C23F13/18; C23F13/20; F; F16; F16L; F16L58/00; F16L58/02; F16L58/04; C23F2213/00; C23F2213/30; C23F2213/32
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
15 words
The pipe assembly of claim 1 wherein said nibs are integral with the anode shell.
Claim 2
Dependent Claim
92 words
A corrosion-protected pipe assembly comprising: a normally corrodible pipe; a rust and corrosion resistant coating on said pipe; a sacrificial anode secured to and surrounding the coating; and electrical contact means extending between the pipe and the anode for electrically connecting the anode to the pipe, said electrical contact means comprising electrical conductive means spacing said anode from the pipe to form an annular mold between the anode and pipe and port means through the wall of said anode as an inlet for delivering fluid corrosion-resistant coating material into the annular mold.
Claim 3
Dependent Claim
98 words
A pipe joint assembly comprising the assembly of claim 3 wherein said pipe comprises a pair of pipe sections joined by welded means at a joint, said corrosion-resistant coating is on each pipe section and terminates at a cutback short of the joint and including additional corrosion-resistant coating material covering the two pipes at the cutback and extending to the ends of the coating on each pipe section, and wherein said anode comprises a tubular member surrounding the additional coating material on the joined pipes at the cutback with said contact means embedded in the additional coating material.
Claim 4
Dependent Claim
65 words
A corrosion-protected pipe assembly comprising: a normally corrodible pipe; a rust and corrosion-resistant coating on said pipe; a sacrificial anode secured to and surrounding the coating; and a plurality of electrical conductive balls of proper size for contacting the pipe and the inner wall of the anode, said coating securing said balls between the anode and pipe in electrical contact with the anode and pipe.
Claim 5
Dependent Claim
98 words
A pipe joint assembly comprising the assembly of claim 5 wherein said pipe comprises a pair of pipe sections joined by welded means at a joint, said corrosion-resistant coating is on each pipe section and terminates at a cutback short of the joint and including additional corrosion-resistant coating material covering the two pipes at the cutback and extending to the ends of the coating on each pipe section, and wherein said anode comprises a tubular member surrounding the additional coating material on the joined pipes at the cutback with said conductive balls embedded in the additional coating material.
Claim 6
Dependent Claim
71 words
A corrosion-protected pipe assembly comprising: a normally corrodible pipe; a rust- and corrosion-resistant coating on said Pipe; a sacrificial anode secured to and surrounding the coating, said anode including a sheet of tubular configuration having a strap members for surrounding said sheet for holding said sheet in tubular configuration around the pipe; and electrical contact means extending between the pipe and the anode for electrically connecting the anode to the pipe.
Claim 7
Dependent Claim
95 words
A pipe joint assembly comprising the assembly of claim 7 wherein said pipe comprises a pair of pipe sections joined by welded means at a joint, said corrosion-resistant coating is on each pipe section and terminates at a cutback short of the joint and including additional corrosion resistant coating material covering the two pipes at the cutback and extending to the ends of the coating on each pipe section, and wherein said anode surrounds the additional coating material on the joined pipes at the cutback with said contact means embedded in the additional coating material.
Claim 8
Dependent Claim
72 words
A corrosion-protected pipe assembly comprising a normally corrodible pipe; and anode shell means surrounding said pipe defining a cylindrical sacrificial anode having a portion of the anode for electrical contact with the pipe, said shell means comprising two individual integral longitudinal anode shell pieces having a longitudinal seam line and means for opening, closing and securing the shell in closed position surrounding the pipe and electrically contacting the anode with the pipe.
Claim 9
Dependent Claim
31 words
The pipe assembly of claim 9 wherein said anode has an inwardly tapered longitudinal surface toward at least one end thereof defining a reducing surface for longitudinally dragging the pipe assembly.
Claim 10
Dependent Claim
41 words
A corrosion-protected pipe assembly comprising a normally corrodible pipe and a sacrificial anode shell surrounding the pipe and having an outer surface tapered toward at least one end of the anode shell defining a drag-reducing surface for longitudinally dragging the assembly.
Claim 11
Dependent Claim
18 words
The pipe assembly of claim 11 wherein said outer surface is tapered toward both ends of the shell.
Claim 12
Dependent Claim
79 words
A corrosion-protected pipe comprising a normally corrodable pipe, a rust- and corrosion-resistant coating on the pipe, a cylindrical sacrificial anode comprising two integral pieces surrounding and secured to the pipe and having a longitudinal seam line for opening and closing the anode about the pipe and an electrical contact means carried by the anode extending between the anode and the pipe, engaging the pipe and embedded in the coating to electrically insulate the points of contact by the coating.
Claim 13
Dependent Claim
21 words
The corrosion-protected pipe of claim 13 wherein the seam line of said anode comprises means for opening and closing the anode.
Claim 14
Dependent Claim
24 words
The corrosion-protected pipe of claim 13 wherein said anode comprises a pair of shell halves and means securing said shell halves around said pipe.
Claim 15
Dependent Claim
13 words
The corrosion-protected pipe of claim 15 wherein said securing means comprises bolt means.
Claim 16
Dependent Claim
15 words
The corrosion-protected pipe of claim 16 wherein said bolt means are composed of plastic material.
Claim 17
Dependent Claim
21 words
The corrosion-protected pipe of claim 13 wherein said corrosion-resistant coating comprises a layer of pitch base extrudate wrapped on the pipe.
Claim 18
Dependent Claim
21 words
The corrosion-protected pipe of claim 18 including a layer of pitch base mastic between the layer of extrudate and the anode.
Claim 19
Dependent Claim
69 words
A corrosion-protected pipe assembly comprising a normally corrodible pipe, a rust- and corrosion-resistant coating on said pipe, a generally tubular sacrificial anode comprising two integral pieces closed at a longitudinal seam line and secured around the pipe and coating, and electrical contact means extending from said anode and penetrating said coating in electrical contact with the pipe member, said contact means spacing said anode outwardly from said pipe member.
Claim 20
Dependent Claim
43 words
The assembly of claim 20 wherein said electrical contact means is of sufficient length to space the anode outwardly from the coating and including additional coating material generally filling the space between the pipe cOating and the anode for insulating said contact means.
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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) | 1974-11-29 | 1975-05-31 | 1975-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-29 | 1979-05-31 | 1979-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-29 | 1983-05-31 | 1983-11-30 | $7700.00 | Window Closed / Lapsed |