Patent DE747937C successfully refreshed from Google Patents.
US3346938A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a coil spring
Assignee: Aero Motive Manufacturing Co
•
Filing: 1965-10-04
•
Granted: 1967-10-17
•
Expires: 1985-10-04
Abstract
No abstract record available.
Inventors
- 👤 Roger T Becker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:37
CPC Classifications
G; G04; G04D; G04D3/00; G04D3/0002; G04D3/0005; G04D3/0007; B; B21; B21F; B21F3/00; G04B; G04B1/00; G04B1/10; G04B1/14; G04B1/145; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49609; Y10T29/49995; Y10T29/49996
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
129 words
IN A METHOD FOR MAKING A COIL SPRING FROM A STRIP OF STEEL CUT FROM A RELATIVELY SOFT SHEET THEREOF, THE STEPS COMPRISING: ENGAGING THE OPPOSITE LATERAL EDGES OF SAID STRIP WITH ABRADING INSTRUMENTS FOR REMOVING A PORTION OF THE EDGE MATERIAL; HEAT TREATING AND THEREBY HARDENING THE STRIP MATERIAL AFTER SAID ABRADING; ENGAGING THE OPPOSITE LATERAL EDGES OF SAID STRIP MATERIAL WITH ABRADING INSTRUMENTS AND THEREBY REMOVING ADDITIONAL MATERIAL THEREFROM SO THAT SAID STRIP IS SUBSTANTIALLY AT ITS FINISHED WIDTH; CUTTING SAID STRIP INTO PREDETERMINED LENGTHS AND LOOSELY COILING EACH LENGTH INTO SUBSTANTIALLY CONCENTRIC LOOPS AND FASTENING SAID LOOPS TOGETHER; FORMING ATTACHMENT MEANS ON THE OUTER END PORTION OF EACH LOOSE COIL; FORMING A RELATIVELY TIGHT RADIUS OF CURVATURE IN THE INNER END PORTION OF EACH LOOSE COIL;
Claim 2
Dependent Claim
129 words
IN A METHOD FOR MAKING A COIL SPRING FROM A STRIP OF STEEL CUT FROM A RELATIVELY SOFT SHEET THEREOF, THE STEPS COMPRISING: ENGAGING THE OPPOSITE LATERAL EDGES OF SAID STRIP WITH ABRADING INSTRUMENTS FOR REMOVING A PORTION OF THE EDGE MATERIAL; HEAT TREATING AND THEREBY HARDENING THE STRIP MATERIAL AFTER SAID ABRADING; ENGAGING THE OPPOSITE LATERAL EDGES OF SAID STRIP MATERIAL WITH ABRADING INSTRUMENTS AND THEREBY REMOVING ADDITIONAL MATERIAL THEREFROM SO THAT SAID STRIP IS SUBSTANTIALLY AT ITS FINISHED WIDTH; CUTTING SAID STRIP INTO PREDETERMINED LENGTHS AND LOOSELY COILING EACH LENGTH INTO SUBSTANTIALLY CONCENTRIC LOOPS AND FASTENING SAID LOOPS TOGETHER; FORMING ATTACHMENT MEANS ON THE OUTER END PORTION OF EACH LOOSE COIL; FORMING A RELATIVELY TIGHT RADIUS OF CURVATURE IN THE INNER END PORTION OF EACH LOOSE COIL;
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) | 1970-10-16 | 1971-04-17 | 1971-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-16 | 1975-04-17 | 1975-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-16 | 1979-04-17 | 1979-10-17 | $7700.00 | Window Closed / Lapsed |