Patent US3230089A successfully refreshed from Google Patents.
Patent US2843374A successfully refreshed from Google Patents.
US2843374A
Expired / Lapsed
US
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Shell hardened torsion bar and process of making same
Assignee: Motors Liquidation Co
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Filing: 1954-07-16
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Granted: 1958-07-15
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Expires: 1974-07-16
Abstract
No abstract record available.
Inventors
- 👤 Alfred L Boegehold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:10
CPC Classifications
B; B60; B60G; B60G21/00; B60G21/02; B60G21/04; B60G21/05; B60G21/055; B60G11/00; B60G11/18; F; F16; F16F; F16F1/00; F16F1/02; F16F1/14; B60G2204/00; B60G2204/10; B60G2204/12; B60G2204/122; B60G2204/1226; B60G2206/00; B60G2206/01; B60G2206/20; B60G2206/201; B60G2206/40; B60G2206/42; B60G2206/427; Y; Y10; Y10S; Y10S464/00; Y10S464/902
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
A TORSION BAR SPRING COMPRISING A HIGH CARBON STEEL SHAFT OF CIRCULAR CROSS SECTION CONSISTING OF .72 TO .95% CARBON, .30 TO .60% MANGANESE, SILICON LESS THAN .50%, .040% PHOSPHORUS (MAX.), SULPHUR .050% (MAX.), SAID THE BALANCE IRON, AND HAVING A HARD SURFACE SHELL OF RELATIVELY SHALLOW DEPTH AND A SOFTER CORE PORTION, THE DROP IN HARDNESS FROM THE HARD SHELL TO THE CORE TAKING PLACE IN A RELATIVELY SHORT DISTANCE INWARDLY FROM THE HARD SHELL.
Claim 2
Dependent Claim
76 words
A TORSION BAR SPRING COMPRISING A HIGH CARBON STEEL SHAFT OF CIRCULAR CROSS SECTION CONSISTING OF .72 TO .95% CARBON, .30 TO .60% MANGANESE, SILICON LESS THAN .50%, .040% PHOSPHORUS (MAX.), SULPHUR .050% (MAX.), SAID THE BALANCE IRON, AND HAVING A HARD SURFACE SHELL OF RELATIVELY SHALLOW DEPTH AND A SOFTER CORE PORTION, THE DROP IN HARDNESS FROM THE HARD SHELL TO THE CORE TAKING PLACE IN A RELATIVELY SHORT DISTANCE INWARDLY FROM THE HARD SHELL.
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) | 1961-07-14 | 1962-01-13 | 1962-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-14 | 1966-01-13 | 1966-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-14 | 1970-01-13 | 1970-07-15 | $7700.00 | Window Closed / Lapsed |