Patent US3645522A successfully refreshed from Google Patents.
US3645522A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spring leaf
Assignee: Boeing North American Inc
•
Filing: 1970-06-01
•
Granted: 1972-02-29
•
Expires: 1990-06-01
Abstract
Abstract A spring leaf comprising an integral substantially cylindrical eye structure on at least one of its ends consisting essentially of adjacent parallel portions cylindrically curved in opposite directions out of the plane of the leaf.
Inventors
- 👤 Frederick T Rowland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:55
CPC Classifications
F; F16; F16F; F16F1/00; F16F1/02; F16F1/18; F16F1/26; B; B60; B60G; B60G11/00; B60G11/02; B60G11/10; B60G11/12
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
55 words
A spring leaf comprising an integral substantially cylindrical eye structure located at least at one of its ends consisting essentially of adjacent end portions curved in opposite directions out of the plane of the leaf, the terminal edges of said spring end portions being disposed adjacenT the juncture of the eye structure with the leaf.
Claim 2
Dependent Claim
55 words
A spring leaf comprising an integral substantially cylindrical eye structure located at least at one of its ends consisting essentially of adjacent end portions curved in opposite directions out of the plane of the leaf, the terminal edges of said spring end portions being disposed adjacenT the juncture of the eye structure with the leaf.
Claim 3
Dependent Claim
42 words
A spring leaf as defined in claim 1, wherein at least one of spring end portions is connected to the leaf by a smoothly curved junction and the terminal edges of all of said spring end portions are disposed adjacent said junction.
Claim 4
Dependent Claim
39 words
A spring leaf as defined in claim 1, wherein the total internal bearing surface area of the portions curved in one direction are equal to the total internal bearing surface areas of the portions curved in the opposite direction.
Claim 5
Dependent Claim
48 words
A spring leaf as defined in claim 1, wherein said eye structure comprises an intermediate end portion curved in one direction out of the plane of the spring leaf, and adjacent opposite side edge portions curved in the opposite direction out of the plane of the spring leaf.
Claim 6
Dependent Claim
25 words
The spring leaf defined in claim 4, wherein said intermediate portion is centrally disposed and of approximately twice the width of each side edge portion.
Claim 7
Dependent Claim
19 words
The spring leaf defined in claim 4, wherein said intermediate and side edge portions are of the same length.
Claim 8
Dependent Claim
35 words
The spring leaf defined in claim 4, wherein said intermediate portion is connected to said leaf by a smoothly curved junction, and the terminal edges of all of said portions are disposed adjacent said junction.
Claim 9
Dependent Claim
26 words
The spring leaf defined in claim 1, wherein said eye structure comprises two side-by-side cylindrical portions oppositely curved out of the plane of said spring leaf.
Claim 10
Dependent Claim
17 words
The spring leaf defined in claim 8, wherein said curved end portions are of substantially equal width.
References Cited (Backward Citations)
US941521A
Cited
FR592558A
Cited
DE455167C
Cited
US2608752A
Cited
US2568169A
Cited
US2510418A
Cited
US2682399A
Cited
US2932056A
Cited
US3389902A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-28 | 1975-08-30 | 1976-02-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-28 | 1979-08-30 | 1980-02-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-28 | 1983-08-30 | 1984-02-29 | $7700.00 | Window Closed / Lapsed |