US3741252A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pipe protector
Assignee: Hydril LLC
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Filing: 1971-09-14
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Granted: 1973-06-26
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Expires: 1991-09-14
Abstract
Abstract A well pipe protector comprises: A. A C-shaped body including a metallic core and a rigid plastic sheath attached to the core and extending outwardly therefrom, B. NON-METALLIC TERMINALS IN THE BODY TO BE DRAWN TOGETHER IN INTERFITTING RELATION FOR RETENTION AFTER LATERAL APPLICATION OF THE BODY ABOUT THE PIPE, AND C. ELASTOMER INSERT MEANS CARRIED AT THE INNER SIDE OF THE BODY TO BE COMPRESSED BETWEEN THE BODY AND PIPE IN RESPONSE TO SAID DRAWING TOGETHER OF THE TERMINALS.
Inventors
- 👤 F Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:50
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/10; E21B17/1042; E21B17/105; F; F16; F16L; F16L58/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
105 words
In a well pipe protector, a. a C-shaped body including a metallic core and a rigid plastic sheath attached to the core and extending thereabout, b. the body having non-metallic terminals to be drawn together in interfitting relation for retention after lateral application of the body about the pipe, said terminals defined by the rigid plastic sheath and defining longitudinally alignable openings to pass a fastener, said openings being everywhere outwardly sPaced from the core, and c. elastomer insert means carried at the inner side of the body to be compressed between the body and pipe in response to said drawing together of the terminals.
Claim 2
Dependent Claim
105 words
In a well pipe protector, a. a C-shaped body including a metallic core and a rigid plastic sheath attached to the core and extending thereabout, b. the body having non-metallic terminals to be drawn together in interfitting relation for retention after lateral application of the body about the pipe, said terminals defined by the rigid plastic sheath and defining longitudinally alignable openings to pass a fastener, said openings being everywhere outwardly sPaced from the core, and c. elastomer insert means carried at the inner side of the body to be compressed between the body and pipe in response to said drawing together of the terminals.
Claim 3
Dependent Claim
35 words
The protector of claim 1 wherein the elastomer insert means compresses a perforated sleeve lining and bonded to the inner side of the body, the core containing multiple perforations, the sheath projecting into said perforations.
Claim 4
Dependent Claim
32 words
The protector of claim 1 wherein the body has a split between the terminals, and the sheath being locally weakened so that the adjacent core extent provides a hinge opposite the split.
Claim 5
Dependent Claim
13 words
The protector of claim 1 wherein the plastic sheath defines longitudinal external flutes.
Claim 6
Dependent Claim
12 words
The protector of claim 1 wherein the sheath consists of thermoplastic material.
Claim 7
Dependent Claim
21 words
The protector of claim 2 wherein the sleeve and core form terminals overlapping the sheath terminals at the inner sides thereof.
Claim 8
Dependent Claim
22 words
The protector of claim 1 wherein the terminals are defined by said plastic sheath as first and second groups of staggered teeth.
Claim 9
Dependent Claim
39 words
The protector of claim 7 wherein the core comprises spring steel having an untensioned position in which the teeth groups are spaced apart, the core being resiliently expandable to pass well pipe through the space between said tooth groups.
Claim 10
Dependent Claim
25 words
The protector of claim 8 wherein the plastic sheath has reduced thickness at the side thereof opposite said tooth groups thereby to provide a hinge.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |