Patent US2764514A successfully refreshed from Google Patents.
US2764514A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing steel rods for prestressing concrete
Assignee: Individual
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Filing: 1954-06-28
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Granted: 1956-09-25
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Expires: 1974-06-28
Abstract
No abstract record available.
Inventors
- 👤 Lee Donovan Henry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:31
CPC Classifications
C; C21; C21D; C21D8/00; C21D8/06; C21D8/08; B; B21; B21F; B21F9/00; B21F9/002; B21F9/005
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
150 words
A METHOD OF PRODUCING A HIGH TENSILE STEEL MEMBER FOR PRESTRESSING CONCRETE AND OTHER STRUCTURES WHICH COMPRISES PROVIDING A ROLLED BAR CONTAINING 0.35% TO 0.65% CARBON, MANGANESE UP TO 1.5% AND SILICON UP TO 2.2%, SAID BAR HAVING AN ULTIMATE STRENGTH EXCEEDING 140,000 P.S.I., A 0.2% PROOF STRESS OF OVER 120,000 P.S.I. AND SUBSTANTIALLY NO CREEP AT A STRESS OF ABOUT 60% OF THE ULTIMATE STRENGTH, SAID BAR BEING NON-STRETCHABLE IN THE AS-ROLLED CONDITION, THE STEPS COMPRISING AGING SAID BAR TO REMOVE OCCULDED HYDROGEN AND THEN STRETCHING THE BAR BY SLOWLY APPLYING TENSION TO THE BAR SO AS TO APPROACH AND EXCEED THE YIELD POINT, WHEREBY A YIELD POINT FLOW SPREADS ALONG THE ENTIRE LENGTH OF THE BAR WHEN THE YIELD POINT IS REACHED, THE APPLICATION OF TENSION BEING CONTINUED UNTIL THE BAR HAS BEEN GIVEN A PERMANENT ELONGATION OF FROM 3% TO 5% AND SAID PROOF STRESS IS OBTAINED.
Claim 2
Independent Claim
150 words
A METHOD OF PRODUCING A HIGH TENSILE STEEL MEMBER FOR PRESTRESSING CONCRETE AND OTHER STRUCTURES WHICH COMPRISES PROVIDING A ROLLED BAR CONTAINING 0.35% TO 0.65% CARBON, MANGANESE UP TO 1.5% AND SILICON UP TO 2.2%, SAID BAR HAVING AN ULTIMATE STRENGTH EXCEEDING 140,000 P.S.I., A 0.2% PROOF STRESS OF OVER 120,000 P.S.I. AND SUBSTANTIALLY NO CREEP AT A STRESS OF ABOUT 60% OF THE ULTIMATE STRENGTH, SAID BAR BEING NON-STRETCHABLE IN THE AS-ROLLED CONDITION, THE STEPS COMPRISING AGING SAID BAR TO REMOVE OCCULDED HYDROGEN AND THEN STRETCHING THE BAR BY SLOWLY APPLYING TENSION TO THE BAR SO AS TO APPROACH AND EXCEED THE YIELD POINT, WHEREBY A YIELD POINT FLOW SPREADS ALONG THE ENTIRE LENGTH OF THE BAR WHEN THE YIELD POINT IS REACHED, THE APPLICATION OF TENSION BEING CONTINUED UNTIL THE BAR HAS BEEN GIVEN A PERMANENT ELONGATION OF FROM 3% TO 5% AND SAID PROOF STRESS IS OBTAINED.
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) | 1959-09-25 | 1960-03-26 | 1960-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-09-25 | 1964-03-26 | 1964-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-09-25 | 1968-03-26 | 1968-09-25 | $7700.00 | Window Closed / Lapsed |