US3230118A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of developing high physical properties in ferrous material and product produced thereby
Assignee: RBS INDUSTRIES Inc A CORP OF
•
Filing: 1961-08-15
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Granted: 1966-01-18
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Expires: 1981-08-15
Abstract
No abstract record available.
Inventors
- 👤 Marshall W Tufts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:30
CPC Classifications
C; C21; C21D; C21D8/00; C21D1/00; C21D1/26; C21D1/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
IN THE METHOD OF IMPARTING INCREASED PHYSICAL PROPERTIES TO CARBON BEARING STEEL STOCK WHICH RESPONDS TO STRAIN OR PRECIPITATION HARDENING, THESTEPS COMPRISING PROVIDING SAID STOCK HAVING A CROSS SECTIONAL AREA GREATER THAN A FINAL, DESIRED CROSS SECTIONAL AREA, REDUCING THE CROSS SECTIONAL AREA BY APPLYING A PURE TENSILE STRESS TO THE ENTIRE CROSS SECTIONAL AREA OF THE STOCK UNTIL A PERMANENT SET IS IMPARTED TO IT, SUBJECTING THE STRESSED STOCK TO A TEMPERATURE BELOW THE RECRYSTALLIZATION TEMPERATURE OF THE STOCK IN ITS UNSTRESSED CONDITION TO YIELD A STRUCTURE HAVING INCREASED PHYSICAL PROPERTIES, AND COLD SIZING THE STOCK TO THE FINAL DESIRED SIZE.
Claim 2
Dependent Claim
102 words
IN THE METHOD OF IMPARTING INCREASED PHYSICAL PROPERTIES TO CARBON BEARING STEEL STOCK WHICH RESPONDS TO STRAIN OR PRECIPITATION HARDENING, THESTEPS COMPRISING PROVIDING SAID STOCK HAVING A CROSS SECTIONAL AREA GREATER THAN A FINAL, DESIRED CROSS SECTIONAL AREA, REDUCING THE CROSS SECTIONAL AREA BY APPLYING A PURE TENSILE STRESS TO THE ENTIRE CROSS SECTIONAL AREA OF THE STOCK UNTIL A PERMANENT SET IS IMPARTED TO IT, SUBJECTING THE STRESSED STOCK TO A TEMPERATURE BELOW THE RECRYSTALLIZATION TEMPERATURE OF THE STOCK IN ITS UNSTRESSED CONDITION TO YIELD A STRUCTURE HAVING INCREASED PHYSICAL PROPERTIES, AND COLD SIZING THE STOCK TO THE FINAL DESIRED SIZE.
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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) | 1969-01-17 | 1969-07-19 | 1970-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-17 | 1973-07-19 | 1974-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-17 | 1977-07-19 | 1978-01-18 | $7700.00 | Window Closed / Lapsed |