Patent US3656808A successfully refreshed from Google Patents.
US3656808A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chair
Assignee: Individual
•
Filing: 1970-06-09
•
Granted: 1972-04-18
•
Expires: 1990-06-09
Abstract
Abstract A chair characterized by a frame structure formed by a single frame member having a continuously curved shape. The frame member includes an arcuate planar floor engaging portion, an arcuate inclined riser portion, and an inclined arcuate seat support portion. A seat is suspended from the frame seat support portion and may be fabricated of flexible material such as fabric, or may be of a rigid material such as molded plastic.
Inventors
- 👤 Ching-Yu Chang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:33
CPC Classifications
A; A47; A47C; A47C5/00; A47C5/04; A47C5/06; Y; Y10; Y10S; Y10S297/00; Y10S297/11
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
58 words
A chair frame, comprising a generally helical single continuously curved rod-like member having a planar lowermost arcuate portion having a uniform radius of curvature adapted to rest upon a floor to support said member, and having an uppermost planar arcuate seat support portion having a uniform radius of curvature inclined to the plane of said lowermost arcuate portion.
Claim 2
Dependent Claim
58 words
A chair frame, comprising a generally helical single continuously curved rod-like member having a planar lowermost arcuate portion having a uniform radius of curvature adapted to rest upon a floor to support said member, and having an uppermost planar arcuate seat support portion having a uniform radius of curvature inclined to the plane of said lowermost arcuate portion.
Claim 3
Dependent Claim
147 words
A chair comprising a frame, and a seat, said frame comprising a single continuously curved rod-like frame member, said frame member including a horizontal arcuate planar floor engaging portion having a uniform radius of curvature, a planar arcuate riser portion having a uniform radius of curvature extending from one end of said floor engaging portion, the plane of said riser portion being inclined at an acute angle to that of said floor engaging portion, and a planar arcuate seat support portion having a uniform radius of curvature extending from the upper end of said riser portion, the plane of said seat support portion being inclined at an acute angle with respect to that of said floor engaging portion, the transitions between said adjoining frame portions comprising smoothly curved continuations of the arcs of said respective portions, said seat being peripherally supported by said arcuate seat support portion.
Claim 4
Dependent Claim
147 words
A chair comprising a frame, and a seat, said frame comprising a single continuously curved rod-like frame member, said frame member including a horizontal arcuate planar floor engaging portion having a uniform radius of curvature, a planar arcuate riser portion having a uniform radius of curvature extending from one end of said floor engaging portion, the plane of said riser portion being inclined at an acute angle to that of said floor engaging portion, and a planar arcuate seat support portion having a uniform radius of curvature extending from the upper end of said riser portion, the plane of said seat support portion being inclined at an acute angle with respect to that of said floor engaging portion, the transitions between said adjoining frame portions comprising smoothly curved continuations of the arcs of said respective portions, said seat being peripherally supported by said arcuate seat support portion.
Claim 5
Dependent Claim
127 words
A chair frame comprising a single continuously curved rod-like frame member, said frame member including a horizontal arcuate planar floor engaging portion having a uniform radius of curvature, a planar arcuate riser portion having a uniform radius of curvature extending from one end of said floor engaging portion, the plane of said riser portion being inclined at an acute angle to that of said floor engaging portion, and a planar arcuate seat support portion having a uniform radius of curvature extending from the upper end of said riser portion, the plane of said seat support portion being inclined at an acute angle to that of said floor engaging portion, the transitions between said adjoining frame portions comprising smoothly curved continuations of the arcs of said respective portions.
Claim 6
Dependent Claim
127 words
A chair frame comprising a single continuously curved rod-like frame member, said frame member including a horizontal arcuate planar floor engaging portion having a uniform radius of curvature, a planar arcuate riser portion having a uniform radius of curvature extending from one end of said floor engaging portion, the plane of said riser portion being inclined at an acute angle to that of said floor engaging portion, and a planar arcuate seat support portion having a uniform radius of curvature extending from the upper end of said riser portion, the plane of said seat support portion being inclined at an acute angle to that of said floor engaging portion, the transitions between said adjoining frame portions comprising smoothly curved continuations of the arcs of said respective portions.
Claim 7
Dependent Claim
28 words
A chair frame as claimed in claim 3 wherein the transition between sAid riser portion and said seat support portion is centered at the front of the chair.
Claim 8
Dependent Claim
40 words
A chair frame as claimed in claim 3 wherein the planes of each of said planar floor engaging, riser and seat support portions are perpendicular to a reference plane passing vertically through the chair frame along the front-to-rear axis thereof.
Claim 9
Dependent Claim
19 words
A chair frame as claimed in claim 3 wherein the radii of the arcuate frame portions are substantially equal.
Claim 10
Dependent Claim
19 words
A chair frame as claimed in claim 3 wherein said frame member is formed of a single metal rod.
Claim 11
Dependent Claim
18 words
A chair frame as claimed in claim 3 wherein said frame member is formed of a metal tube.
Claim 12
Dependent Claim
45 words
A chair frame as claimed in claim 3 wherein the arcuate extent of said floor engaging portion comprises approximately 215* , the arcuate extent of said riser portion comprises approximately 180* , and the arcuate extent of said seat supporting portion comprises approximately 325* .
Claim 13
Dependent Claim
27 words
A chair frame as claimed in claim 6, the transition between said floor engaging portion and said riser portion being centered at the rear of the chair.
Claim 14
Dependent Claim
23 words
A chair frame as claimed in claim 3 wherein said floor engaging portion extends beneath the front edge of said seat support portion.
References Cited (Backward Citations)
GB387884A
Cited
US1791453A
Cited
US2325270A
Cited
US2509451A
Cited
US2975827A
Cited
US3069204A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-18 | 1975-10-18 | 1976-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-18 | 1979-10-18 | 1980-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-18 | 1983-10-18 | 1984-04-18 | $7700.00 | Window Closed / Lapsed |