Patent US3667716A successfully refreshed from Google Patents.
US3667716A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telescoping chair base
Assignee: Steelcase Inc
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Filing: 1970-08-31
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Granted: 1972-06-06
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Expires: 1990-08-31
Abstract
Abstract A THREADED CHAIR SPINDLE IS THREADABLY CARRIED BY A NUT WHICH IS ROTATABLY SUPPORTED BY A HUB TUBE SUCH THAT THE LOWER BEARING SURFACE OF THE SPINDLE EXTENDS WITHIN THE HUB TUBE. A SPINDLE COVER TUBE IS LONGITUDINALLY FIXED WITH RESPECT TO SAID SPINDLE AND ENCLOSES THE THREADED PORTION OF THE SPINDLE BUT CAN BE ROTATED WITH RESPECT TO THE SPINDLE. AN ELONGATED, VERTICAL RIB PROJECTS INWARDLY FROM THE INSIDE SURFACE OF THE SPINDLE COVER TUBE AND MATES WITH A VERTICAL GROOVE IN THE SIDE OF THE NUT SO THAT THE SPINDLE AND THE SPINDLE COVER TUBE CAN BE RAISED OR LOWERED BY ROTATING THE SPINDLE COVER TUBE WITH RESPECT TO THE SPINDLE.
Inventors
- 👤 Bernard J Fries
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:16
CPC Classifications
A; A47; A47C; A47C3/00; A47C3/20; A47C3/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-06 | 1975-12-06 | 1976-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-06 | 1979-12-06 | 1980-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-06 | 1983-12-06 | 1984-06-06 | $7700.00 | Window Closed / Lapsed |