US4011109A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing steel filaments
Assignee: Monsanto Co
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Filing: 1975-11-10
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Granted: 1977-03-08
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Expires: 1995-11-10
Abstract
Abstract A method for producing steel filaments having a heat treated microstructure is disclosed. The method comprises the steps of providing a steel coil having a carbon content from about 0.30 to about 0.95, percent by weight, scoring the surface of the steel to form a plurality of grooves that delineate continuous longitudinal segments, heat treating the steel to develop an appropriate metallurgical structure, separating the segments into individual filaments by causing the steel to fracture at the grooves, and then passing the filaments through a mechanical straightener.
Inventors
- 👤 David I. Golland
- 👤 Charles J. Runkle
- 👤 Milan F. Kozak
- 👤 John A. Schey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:32
CPC Classifications
B; B21; B21C; B21C37/00; B21C37/04; B21B; B21B1/00; B21B1/08; B21B1/0815; B23; B23D; B23D31/00; B23D31/002; C; C21; C21D; C21D8/00; C21D8/06; C21D9/00; C21D9/52; C21D2261/00; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49789; Y10T29/4979; Y10T29/49792; Y10T83/00; Y10T83/04; Y10T83/0605
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
87 words
A method for producing continuous lengths of high strength steel filaments, comprising the steps of: a. providing a steel coil having a carbon content from about 0.30 to about 0.95, percent by weight,; b. scoring the surface of said steel to form a plurality of grooves that delineate continuous longitudinal segments; c. heat treating said steel to develop an appropriate metallurgical structure; d. separating said segments into individual filaments by causing said steel to fracture at said grooves; and e. passing said filaments through a mechanical straightener.
Claim 2
Independent Claim
87 words
A method for producing continuous lengths of high strength steel filaments, comprising the steps of: a. providing a steel coil having a carbon content from about 0.30 to about 0.95, percent by weight,; b. scoring the surface of said steel to form a plurality of grooves that delineate continuous longitudinal segments; c. heat treating said steel to develop an appropriate metallurgical structure; d. separating said segments into individual filaments by causing said steel to fracture at said grooves; and e. passing said filaments through a mechanical straightener.
Claim 3
Dependent Claim
16 words
The method of claim 1 wherein said coil thickness is less than 0.020 inches (0.0508 cm).
Claim 4
Dependent Claim
16 words
The method of claim 1 wherein said coil thickness is less than 0.0141 inches (0.0368 cm).
Claim 5
Dependent Claim
13 words
The method of claim 1 wherein said provided steel has a pearlitic microstructure.
Claim 6
Dependent Claim
18 words
The method of claim 1 wherein said scoring comprises feeding said steel into a pair of rotating rolls.
Claim 7
Dependent Claim
21 words
The method of claim 5 wherein said rolls are a pair of engaged cutters that form longitudinal channels in said steel.
Claim 8
Dependent Claim
22 words
The method of claim 5 wherein said rolls have a plurality of predetermined spaced V's formed along the periphery of each roll.
Claim 9
Dependent Claim
22 words
The method of claim 1 wherein said heat treating comprises austenitizing and quenching said steel to form martensite, bainite and mixtures thereof.
Claim 10
Dependent Claim
20 words
The method of claim 5 wherein said segments are separated by feeding said steel into a pair of engaged cutters.
Claim 11
Dependent Claim
53 words
The method of claim 7 wherein said segments are separated by feeding said steel into a pair of rolls having a plurality of V's spaced along their surfaces so that a V is placed into alternate grooves on the top and bottom surfaces of said steel and each segment contains only one V.
Claim 12
Dependent Claim
10 words
The method of claim 1 wherein said steel is tempered.
Claim 13
Dependent Claim
15 words
The method of claim 11 wherein said tempering is conducted before separation of the segments.
Claim 14
Dependent Claim
15 words
The method of claim 11 wherein said tempering is conducted after separation of the segments.
References Cited (Backward Citations)
US2109921A
Cited
US3953250A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-03-07 | 1980-09-06 | 1981-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-07 | 1984-09-06 | 1985-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-07 | 1988-09-06 | 1989-03-08 | $7700.00 | Window Closed / Lapsed |