US3689329A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carbon steel spring elements
Assignee: Caterpillar Inc
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Filing: 1969-08-20
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Granted: 1972-09-05
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Expires: 1989-08-20
Abstract
Abstract A CARBON STEEL COMPOSITION FOR SPRING ELEMENTS IS DISCLOSED WHEREIN THE STEEL INCLUDES CARBON, MANGANESE, FILICON AND BORON. IN ACCORDANCE WITH ITS CLASSIFICATION AS A "CARBON STEEL," IT DOES NOT INCLUDE NORMAL ALLOYING ELEMENTS, PARTICULARLY CHROMIUM. THE PRESENT STEEL IS PARTICULARLY CHARACTERIZED BY EXCELLENT DURABILITY AND FATIGUE LIFE AS WELL AS BY LOW COST. THE CARBON STEEL CONSISTS ESSENTIALLY OF ABOUT .50-.80 PERCENT CARBON, ABOUT 0.50-1.65 PERCENT MANGANESE, ABOUT 0.02-0.60 PERCENT SILICON, ABOUT 0.050 MAXIMUM PERCENT SULFUR, ABOUT 0.040 MAXIMUM PERCENT PHOSPHORUS, ABOUT 0.0005-0.007 PERCNET BORON, BALANCE MAINLY IRON.
Inventors
- 👤 Roy F Kern
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:37
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/002; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/923; Y10T; Y10T428/00; Y10T428/12
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) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |