US3002865A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of strengthening the surface of metallic springs by warm working
Assignee: Associated Spring Corp
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Filing: 1958-10-30
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Granted: 1961-10-03
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Expires: 1978-10-30
Abstract
No abstract record available.
Inventors
- 👤 William R Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:12
CPC Classifications
C; C21; C21D; C21D7/00; C21D7/02; C21D7/04; C21D9/00; C21D9/02; Y; Y10; Y10S; Y10S29/00; Y10S29/036; Y10T; Y10T29/00; Y10T29/49; Y10T29/49609
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
97 words
THE METHOD OF SURFACE STRENGTHENING A SPRING WHICH COMPRISES THE STEPS OF FORMING THE SPRING TO SHAPE, TREATING THE SPRING AS BY HEAT TREATMENT OR COLD WORKING TO IMPART THERETO THE PRINCIPAL PART OF THE DESIRED PHYSICAL PROPERTIES OF THE METAL FROM WHICH THE SPRING IS FORMED, HEATING THE SPRING TO A TEMPERATURE ABOVE ROOM TEMPERATURE AND JUST BELOW THE SOFTENING TEMPERATURE OF THE METAL OF WHICH THE SPRING IS FORMED, AND WHILE MAINTAINING THE SPRING AT SUCH TEMPERATURE SUBJECTING IT TO SURFACE MECHANICAL WORKING WHICH DOES NOT PRODUCE ANY SUBSTANTIAL CHANGE IN ITS SHAPE OR SIZE.
Claim 2
Independent Claim
97 words
THE METHOD OF SURFACE STRENGTHENING A SPRING WHICH COMPRISES THE STEPS OF FORMING THE SPRING TO SHAPE, TREATING THE SPRING AS BY HEAT TREATMENT OR COLD WORKING TO IMPART THERETO THE PRINCIPAL PART OF THE DESIRED PHYSICAL PROPERTIES OF THE METAL FROM WHICH THE SPRING IS FORMED, HEATING THE SPRING TO A TEMPERATURE ABOVE ROOM TEMPERATURE AND JUST BELOW THE SOFTENING TEMPERATURE OF THE METAL OF WHICH THE SPRING IS FORMED, AND WHILE MAINTAINING THE SPRING AT SUCH TEMPERATURE SUBJECTING IT TO SURFACE MECHANICAL WORKING WHICH DOES NOT PRODUCE ANY SUBSTANTIAL CHANGE IN ITS SHAPE OR SIZE.
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) | 1964-10-02 | 1965-04-03 | 1965-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-10-02 | 1969-04-03 | 1969-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-10-02 | 1973-04-03 | 1973-10-03 | $7700.00 | Window Closed / Lapsed |