US3893778A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anti-corrosion pipe protector
Assignee: Hydril LLC
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Filing: 1974-06-10
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Granted: 1975-07-08
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Expires: 1994-06-10
Abstract
Abstract A flexible flap is carried by a drill pipe protector in such a manner as to protect the pipe, inwardly of protector terminals, against corrosion. Also, the exterior of the protector is tapered to deflect corrosive mud away from the pipe and the flap ends.
Inventors
- 👤 Fred D Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:07
CPC Classifications
F; F16; F16L; F16L58/00; E; E21; E21B; E21B17/00; E21B17/10; E21B17/1042; E21B17/105
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
89 words
In a well pipe protector, a. a C-shaped body defining a zig-zag split, b. terminals on the body to be drawn together in interfitting relatIon for retention proximate said split after application of the body about the pipe, and c. a protective flap carried by said body and having freely projecting inwardly and outwardly flexible extent to protectively overlap the side of the pipe inwardly of said terminals and to fully bridge said zig-zag split at the inner side thereof in response to said drawing together of the terminals.
Claim 2
Dependent Claim
89 words
In a well pipe protector, a. a C-shaped body defining a zig-zag split, b. terminals on the body to be drawn together in interfitting relatIon for retention proximate said split after application of the body about the pipe, and c. a protective flap carried by said body and having freely projecting inwardly and outwardly flexible extent to protectively overlap the side of the pipe inwardly of said terminals and to fully bridge said zig-zag split at the inner side thereof in response to said drawing together of the terminals.
Claim 3
Dependent Claim
25 words
The protector of claim 1 wherein said split extends lengthwise of said body, and said flap extends lengthwise throughout the major length of the body.
Claim 4
Dependent Claim
86 words
The protector of claim 2 wherein said body has an inner wall and circumferentially spaced inner edge portions adapted to be drawn toward one another in response to said drawing together of the terminals, the flap carried by only one of the edge portions and so as to sealingly engage the other inner edge portion at the inner side thereof, said inner edge portions being recessed radially outwardly relative to a cylinder defined by said body inner wall upon application of the body about the pipe.
Claim 5
Dependent Claim
14 words
The protector of claim 3 wherein the flap consists of a corrosion resistant material.
Claim 6
Dependent Claim
51 words
The protector of claim 3 wherein the flap normally extends freely into the space within the body inwardly of said edge portions, thereby to be deflected outwardly by the pipe into engagement with the other outwardly recessed edge portion of the body in response to said drawing together of the ternimals.
Claim 7
Dependent Claim
31 words
The protector of claim 3 including the pipe about which the body extends, the flap engaging the pipe and deflected thereby into engagement with the other edge portion of the body.
Claim 8
Dependent Claim
26 words
The protector of claim 6 wherein the flap also extends lengthwise throughout the major length of the body, and bridges the split which has zig-zag configuration.
Claim 9
Dependent Claim
45 words
The protector of claim 2 wherein the body has inner and outer sides, the outer side of the body tapering frusto-conically toward and into close proximity to said inner side at opposite ends of the body for deflecting mud away from the body inner wall.
Claim 10
Dependent Claim
28 words
The protector of claim 1 wherein the body consists of non-metallic material, there being a C-shaped metal clamp embedded in the body, said terminals integral with the clamp.
References Cited (Backward Citations)
US2636787A
Cited
US3652138A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-07 | 1979-01-06 | 1979-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-07 | 1983-01-06 | 1983-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-07 | 1987-01-06 | 1987-07-08 | $7700.00 | Window Closed / Lapsed |