Patent US1222147A successfully refreshed from Google Patents.
Patent US4235408A successfully refreshed from Google Patents.
US4235408A
Expired / Lapsed
US
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Swivel-chair frame
Assignee: Knoll Inc
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Filing: 1978-02-27
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Granted: 1980-11-25
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Expires: 1998-02-27
Abstract
Abstract A swinging-seat swivel chair includes a vertical stud that carries a horizontal hollow pin at the end of which are pivoted two supporting arms for a seat. A torsion bar is housed in the interior of the pin with one end coupled to the pin and the other end coupled to the arm at the other end of the torsion bar. A rigid longitudinal member is included substantially parallel to and spaced from the pin and rigidly interconnecting the arms.
Inventors
- 👤 Richard F. Sapper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:25
CPC Classifications
A; A47; A47C; A47C3/00; A47C3/02; A47C3/025; A47C3/026; A47C7/00; A47C7/36; A47C7/40; A47C7/44; A47C7/445; A47C7/4454
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
In a swinging-seat swivel chair that includes a frame comprising a vertical stud carrying a horizontal hollow pin at the end of which there are pivoted two supporting arms for a seat, and a torsion bar being housed in the interior of the pin with one end coupled to the pin and the other end coupled to the arm at said other end of the torsion bar, the improvement comprising a rigid longitudinal member substantially parallel to and spaced from said pin and rigidly interconnecting said arms.
Claim 2
Dependent Claim
87 words
In a swinging-seat swivel chair that includes a frame comprising a vertical stud carrying a horizontal hollow pin at the end of which there are pivoted two supporting arms for a seat, and a torsion bar being housed in the interior of the pin with one end coupled to the pin and the other end coupled to the arm at said other end of the torsion bar, the improvement comprising a rigid longitudinal member substantially parallel to and spaced from said pin and rigidly interconnecting said arms.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-11-25 | 1984-05-26 | 1984-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-25 | 1988-05-26 | 1988-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-25 | 1992-05-26 | 1992-11-25 | $7700.00 | Window Closed / Lapsed |