Patent US3741820A successfully refreshed from Google Patents.
US3741820A
Expired / Lapsed
US
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Method for stress relieving metal
Assignee: BONAL MACHINE Co
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Filing: 1970-12-07
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Granted: 1973-06-26
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Expires: 1990-12-07
Abstract
Abstract THE METHOD FOR STRESS RELIEVING METAL BY VIBRATION WHEREIN THE FREQUENCY LOCATIONS OF VIBRATIONAL RESONANT PEAKS ARE FOUND IN THE STRESSED METAL AND THE METAL IS VIBRATED AT A PREFERRED STRESS RELIEVING FREQUENCY TO CHANGE THE FREQUENCY LOCATIONS OF THESE RESONANT PEAKS. WHEN THE RESONANT PEAKS STABILIZE IN NEW FREQUENCY LOCATIONS, STRESS REMOVAL IS COMPLETE. THE PREFERRED STRESS RELIEVING FREQUENCY IS SELECTED FROM THE VIBRATIONAL RESPONSE CHARACTERISTICS OF THE METAL AND IS VERY EFFICIENT IN RELIEVING STRESSES.
Inventors
- 👤 A Hebel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:32
CPC Classifications
C; C21; C21D; C21D10/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |