Patent US3884457A successfully refreshed from Google Patents.
US3884457A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spring in the form of stacked sheet metal plates
Assignee: Individual
•
Filing: 1973-05-14
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Granted: 1975-05-20
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Expires: 1993-05-14
Abstract
Abstract A spring in the form of stacked ribbed and flat sheet metal plates. Ribbed plates having curved ribs produced by etching on both faces with ribs on one face of the plate being staggered in relation to the ribs on the other face of the plate.
Inventors
- 👤 Toma D Leko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:57
CPC Classifications
F; F16; F16F; F16F3/00; F16F3/02; Y; Y10; Y10S; Y10S411/00; Y10S411/955; Y10S411/956; Y10S411/96
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
83 words
A spring in the form of stacked sheet metal plates comprising a number of resilient ribbed metal plates provided with ribs, said ribs extending curvilinearly across both faces of the said ribbed metal plates, said ribs on one face being in staggered relation to the ribs on the opposite face, and flat metal plates having no ribs on either face thereof, said ribbed metal plates being stacked with flat metal plates in between them, and means for maintaining said plates in stacked relation.
Claim 2
Dependent Claim
83 words
A spring in the form of stacked sheet metal plates comprising a number of resilient ribbed metal plates provided with ribs, said ribs extending curvilinearly across both faces of the said ribbed metal plates, said ribs on one face being in staggered relation to the ribs on the opposite face, and flat metal plates having no ribs on either face thereof, said ribbed metal plates being stacked with flat metal plates in between them, and means for maintaining said plates in stacked relation.
References Cited (Backward Citations)
US1963535A
Cited
US2713482A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-19 | 1978-11-18 | 1979-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-19 | 1982-11-18 | 1983-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-19 | 1986-11-18 | 1987-05-20 | $7700.00 | Window Closed / Lapsed |