US3567529A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Differentially treated track bushing
Assignee: Caterpillar Inc
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Filing: 1969-03-03
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Granted: 1971-03-02
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Expires: 1989-03-03
Abstract
Abstract A CYLINDRICAL BUSHING HAVING A LONGITUDINAL BORE THERETHROUGH, THE OUTER DIAMETER OF THE BUSHING BEING HARDENED TO RESIST WEAR WITH THE INNER DIAMETER OF THE BUSHING BEING DIFFERENTIALLY TEMPERED WITH A REDUCED HARDNESS RELATIVE TO THE OUTER DIAMETER IN ORDER TO RESIST SHOCK AND THE DEVELOPMENT OF CRACKS. A METHOD OF MANUFACTURING THE ABOVE BUSHING COMPRISING THE STEPS OF FORMING THE BUSHING, HARDENING AT LEAST THE OUTER DIAMETER OF THE BUSHING, AND THEN DIFFERENTIALLY TEMPERING THE INNER DIAMETER TO A SUBSTANTIALLY REDUCED HARDNESS RELATIVE TO THE OUTER DIAMETER.
Inventors
- 👤 Robert D Burtnett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:30
CPC Classifications
C; C21; C21D; C21D9/00; C21D9/08
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) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |