Patent US3637033A successfully refreshed from Google Patents.
US3637033A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drilling apparatus
Assignee: Individual
•
Filing: 1970-01-06
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Granted: 1972-01-25
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Expires: 1990-01-06
Abstract
Abstract The invention relates to an assembly for collecting magnetic waste material for insertion in the drill string of drilling apparatus. The assembly includes a plurality of magnets held in place around a first nonmagnetic tubular member by means of a second nonmagnetic tubular member which is swaged around the magnets to form a longitudinally extending recess between each pair of magnets.
Inventors
- 👤 William Mayall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:23
CPC Classifications
E; E21; E21B; E21B31/00; E21B31/06; E21B17/00; E21B27/00
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
104 words
Drilling apparatus including an assembly for collecting magnetic waste material, wherein said assembly includes (first) inner aNd (second) outer coaxial tubular members of nonmagnetic material and a plurality of circumferentially spaced magnets located between said tubular members, wherein the magnetic axes and sides of said magnets are parallel to the common longitudinal axis of said tubular members, and wherein said (magnets and said second) outer tubular member (are so arranged as to form) has formed therein a plurality of recesses extending between said magnets parallel to said longitudinal axis, each recess substantially occupying the space between the adjacent sides of two of said magnets.
Claim 2
Dependent Claim
104 words
Drilling apparatus including an assembly for collecting magnetic waste material, wherein said assembly includes (first) inner aNd (second) outer coaxial tubular members of nonmagnetic material and a plurality of circumferentially spaced magnets located between said tubular members, wherein the magnetic axes and sides of said magnets are parallel to the common longitudinal axis of said tubular members, and wherein said (magnets and said second) outer tubular member (are so arranged as to form) has formed therein a plurality of recesses extending between said magnets parallel to said longitudinal axis, each recess substantially occupying the space between the adjacent sides of two of said magnets.
Claim 3
Dependent Claim
20 words
Apparatus as claimed in claim 1, wherein each magnet consists of a plurality of magnetic elements arranged magnetically in series.
Claim 4
Dependent Claim
15 words
Apparatus as claimed in claim 1, wherein the outer tubular member consists of stainless steel.
Claim 5
Dependent Claim
23 words
Apparatus as claimed in claim 1, including strips of nonmagnetic material welded to the outer tubular member at the base of each recess.
Claim 6
Dependent Claim
31 words
Apparatus as claimed in claim 1, wherein the magnets and the outer tubular member are rotatable on the inner tubular member but are normally prevented from rotation thereon by frictional restraint.
Claim 7
Dependent Claim
21 words
Apparatus as claimed in claim 1, wherein said recesses in the outer tubular member are formed by swaging around the magnets.
Claim 8
Dependent Claim
65 words
Apparatus as claimed in claim 1, wherein two longitudinally spaced sets of magnets are arranged on a single inner tubular member, each of said sets of magnets being provided with a respective outer tubular member, wherein the magnets in each set are arranged with like poles adjacent and wherein the north poles of one set are adjacent to the south poles of the other set.
Claim 9
Dependent Claim
35 words
Apparatus as claimed in claim 7, including annular pole caps at each end of each set of magnets, the adjacent pole caps of the two sets of magnets being spaced apart by an annular recess.
Claim 10
Dependent Claim
23 words
Apparatus as claimed in claim 1, wherein there is an even number of magnets and the magnets are arranged with unlike poles adjacent.
Claim 11
Dependent Claim
42 words
Apparatus as claimed in claim 9, including four magnets, wherein two diametrically opposite magnets have their north poles at one end of the assembly while the other two diametrically opposite magnets have their north poles at the other end of the assembly.
Claim 12
Dependent Claim
36 words
Apparatus as claimed in claim 9, wherein rings of nonmagnetic material are provided at both ends of the magnets, and wherein hard facing is provided on the periphery of each ring to protect it from abrasion.
Claim 13
Dependent Claim
35 words
Apparatus as claimed in claim 1, wherein said magnets are arranged with like poles adjacent, wherein the magnets are longitudinally coextensive, and wherein an annular pole cap is provided at each end of the magnets.
Claim 14
Dependent Claim
62 words
Apparatus as claimed in claim 12, wherein the inner tubular member is provided with a central portion of reduced external diameter to accommodate the magnets and pole caps, and wherein said central portion extends axially to a greater distance than the axial extent of the magnets and pole caps so that an annular recess is formed at each end of the assembly.
Claim 15
Dependent Claim
17 words
Apparatus as claimed in claim 12, wherein each pole cap consists of two semicircular portions welded together.
Claim 16
Dependent Claim
20 words
Apparatus as claimed in claim 14, wherein shoulders are provided on the first tubular member to locate the pole caps.
References Cited (Backward Citations)
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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) | 1975-01-24 | 1975-07-26 | 1976-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-24 | 1979-07-26 | 1980-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-24 | 1983-07-26 | 1984-01-25 | $7700.00 | Window Closed / Lapsed |