Patent US3871439A successfully refreshed from Google Patents.
US3871439A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making filament of small cross section
Assignee: Battelle Development Corp
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Filing: 1974-04-01
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Granted: 1975-03-18
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Expires: 1994-04-01
Abstract
Abstract The present invention is a method of making fine filamentary material directly from molten material by rotating the peripheral edge of a machine-threaded cylindrical heat-extracting member in contact with the surface of the molten material.
Inventors
- 👤 Robert E Maringer
- 👤 Carroll E Mobley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:35
CPC Classifications
B; B22; B22D; B22D11/00; B22D11/005; B22D11/06; B22D11/0611; B22D11/0614
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
93 words
A method of making a plurality of filaments having an effective diameter less than 1,500 microns comprising: contacting the free surface of a pool of molten material with the circumferential extremities of a plurality of tapering machine screw threads on the outer radial surface of a cylindrical heatextracting member rotating at a rate yielding a linear speed at said circumferential extremities in excess of 3 ft/sec, the contacting being to a depth no greater than the root depth of said threads and providing a plurality of narrow elongated contacts with the molten material.
Claim 2
Independent Claim
93 words
A method of making a plurality of filaments having an effective diameter less than 1,500 microns comprising: contacting the free surface of a pool of molten material with the circumferential extremities of a plurality of tapering machine screw threads on the outer radial surface of a cylindrical heatextracting member rotating at a rate yielding a linear speed at said circumferential extremities in excess of 3 ft/sec, the contacting being to a depth no greater than the root depth of said threads and providing a plurality of narrow elongated contacts with the molten material.
Claim 3
Independent Claim
104 words
A method of making a plurality of filaments having an effective diameter less than 1,500 microns comprising: contacting the free surface of a pool of molten material with the circumferential extremities of a cylindrical heat-extracting member having on its outer radial surface a plurality of parallel tapering projections canted from the direction of rotation of said member with said member rotating at a rate yielding a linear speed at said circumferential extremities in excess of 3 ft/sec, the contacting being to a depth no greater than the root depth of said projections and providing a plurality of narrow elongated contacts with the molten material.
Claim 4
Independent Claim
104 words
A method of making a plurality of filaments having an effective diameter less than 1,500 microns comprising: contacting the free surface of a pool of molten material with the circumferential extremities of a cylindrical heat-extracting member having on its outer radial surface a plurality of parallel tapering projections canted from the direction of rotation of said member with said member rotating at a rate yielding a linear speed at said circumferential extremities in excess of 3 ft/sec, the contacting being to a depth no greater than the root depth of said projections and providing a plurality of narrow elongated contacts with the molten material.
Claim 5
Dependent Claim
58 words
The method of claim 2 wherein the filaments produced have an effective diameter less than 100 microns including: contacting said free surface with a plurality of triangular cross-section helical machine screws threads on the outer radial surface of said heat-extracting member rotating at a rate yielding a linear speed at said circumferential extremities in excess of 30 ft/sec.
Claim 6
Dependent Claim
30 words
The method of claim 2 wherein said extremities consist essentially of metal and said molten material consists of a material selected from the group consisting of tin, aluminum, or iron.
Claim 7
Dependent Claim
26 words
The method of claim 3 wherein said projections have a pitch of approximately 18 threads per inch and a surface finish smoother than 20 microinches (CLA).
Claim 8
Dependent Claim
16 words
The method of claim 2 wherein the width of said cylindrical heat-extracting Member exceeds one inch.
Claim 9
Dependent Claim
19 words
The method of claim 2 wherein said projections have a pitch of from 4 to 20 threads per inch.
Claim 10
Dependent Claim
27 words
The method of claim 2 wherein said projections have indentations thereon disposed to attenuate the length of the filament produced to equal the distance between said indentations.
Claim 11
Dependent Claim
34 words
The method of claim 2 wherein circumferential air flow induced by rotation of said member is deflected away from said molten material at the point where said member rotates into contact with said material.
Claim 12
Dependent Claim
21 words
The method of claim 2 wherein said cylindrical member has a diameter in the range of from 6 to 12 inches.
Claim 13
Dependent Claim
56 words
The method of claim 2 wherein said projections comprise machine threads and on different portions of said member said threads have opposite pitch directions, whereby with said member rotating the pitch of said threaded portions induces molten material to flow in a direction away from the central portion of the outer radial surface of said member.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |