US3847002A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing steel wire and strand for pre-stressed concrete construction
Assignee: SUZUKE METAL IND CO Ltd
•
Filing: 1972-12-29
•
Granted: 1974-11-12
•
Expires: 1992-12-29
Abstract
Abstract A method of producing steel wires and strands for pre-stressed concrete construction, with low relaxation value and excellent straightness, which comprises applying in the ordinary lowtemperature annealing range of 300*-400*C to cold drawn steel wire and strand formed therefrom containing 0.6 - 0.9 percent of carbon, a tension corresponding to 10-50 percent of the tensile strength of the cold drawn wire at room temperature and, at the same time, a bending stress so as to give 0.1-0.5 percent maximum surface strain.
Inventors
- 👤 A Suzuki
- 👤 M Hagiwara
- 👤 N Teraoka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:17
CPC Classifications
D; D07; D07B; D07B1/00; D07B1/06; D07B1/0693; B; B21; B21F; B21F9/00; B21F9/005; C; C21; C21D; C21D7/00; C21D7/02; C21D7/10; C21D7/105; E; E04; E04C; E04C5/00; E04C5/01; E04C5/02; E04C5/08; D07B2205/00; D07B2205/30; D07B2205/3021; D07B2205/3025; D07B2205/3046; D07B2205/3053; D07B2501/00; D07B2501/20; D07B2501/2015; D07B2501/2023
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
88 words
A METHOD OF PRODUCING STEEL WIRE AND STRAND FOR PRESTRESSED CONCRETE CONSTRUCTION, HAVING LOW RELAXATION VALUE AND EXCELLENT STRAIGHTNESS, WHICH COMPRISES THE STEPS OF APPLYING, IN THE ORDINARY LOW-TEMPERATURE ANNEALING RANGE OF 300* - 400*C, TO COLD DRAWN STEEL WIRE AND STRAND COMPOSED THEREOF, CONTAINING 0.6 - 0.9 PERCENT OF CARBON, A TENSION CORRESPONDING TO 10 - 50 PERCENT OF THE TENSILE STRENGTH OF THE COLD DRAWN WIRE AT ROOM TEMPERATURE AND, SIMULTANEOUSLY APPLYING A BENDING STRESS SO AS TO GIVE 0.1 - 0.5 PERCENT MAXIMUM SURFACE STRAIN.
Claim 2
Independent Claim
88 words
A METHOD OF PRODUCING STEEL WIRE AND STRAND FOR PRESTRESSED CONCRETE CONSTRUCTION, HAVING LOW RELAXATION VALUE AND EXCELLENT STRAIGHTNESS, WHICH COMPRISES THE STEPS OF APPLYING, IN THE ORDINARY LOW-TEMPERATURE ANNEALING RANGE OF 300* - 400*C, TO COLD DRAWN STEEL WIRE AND STRAND COMPOSED THEREOF, CONTAINING 0.6 - 0.9 PERCENT OF CARBON, A TENSION CORRESPONDING TO 10 - 50 PERCENT OF THE TENSILE STRENGTH OF THE COLD DRAWN WIRE AT ROOM TEMPERATURE AND, SIMULTANEOUSLY APPLYING A BENDING STRESS SO AS TO GIVE 0.1 - 0.5 PERCENT MAXIMUM SURFACE STRAIN.
Claim 3
Dependent Claim
48 words
A method according to claim 1 in which the tension applied to the wire corresponds to 10 - 20 pErcent of the tensile strength of the wire at room temperature and in which bending stress is applied so as to give 0.4 - 0.5 percent maximum surface strain.
Claim 4
Dependent Claim
46 words
A method according to claim 1 in which the tension applied to the steel wire corresponds to 15 - 30 percent of the tensile strength of the wire and in which bending stress is applied so as to give 0.3 - 0.4 percent maximum surface strain.
Claim 5
Dependent Claim
46 words
A method according to claim 1 in which the tension applied to the steel wire corresponds to 25 - 45 percent of the tensile strength of the wire and in which bending stress is applied so as to give 0.25 - 0.45 percent maximum surface strain.
Claim 6
Dependent Claim
45 words
A method according to claim 1 in which the tension applied to the wire corresponds to 30 - 40 percent of the tensile strength of the wire and in which bending stress is applied so as to give 0.3 - 0.4 percent maximum surface strain.
Claim 7
Dependent Claim
45 words
A method according to claim 1 in which the tension applied to the wire corresponds to 35 - 45 percent of the tensile strength of the wire and in which bending stress is applied so as to give 0.2 - 0.3 percent maximum surface strain.
Claim 8
Dependent Claim
45 words
A method according to claim 1 in which the tension applied to the wire corresponds to 40 - 50 percent of the tensile strength of the wire, and in which bending stress is applied so as to give 0.1 - 0.2 percent maximum surface strain.
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) | 1977-11-11 | 1978-05-13 | 1978-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-11 | 1982-05-13 | 1982-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-11 | 1986-05-13 | 1986-11-12 | $7700.00 | Window Closed / Lapsed |