Patent US3337261A successfully refreshed from Google Patents.
US3337261A
Expired / Lapsed
US
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Folding wheel chair
Assignee: Individual
•
Filing: 1965-10-23
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Granted: 1967-08-22
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Expires: 1985-10-23
Abstract
No abstract record available.
Inventors
- 👤 Russell E Nihlean
- 👤 Fred A Sass
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:06
CPC Classifications
A; A61; A61G; A61G5/00; A61G5/08; A61G5/0808; A61G5/0816; A61G5/0891; A61G5/10; A61G5/1054; A61G5/1078; A61G5/12; A61G5/125; A61G5/128
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
A FOLDING WHEELCHAIR COMPRISING A SQUARE BOX FRAME HAVING THE LEFT AND RIGHT SIDES THEREOF TELESCOPICALLY ENGAGED TO EACH OTHER FOR COLLAPSING, A SET OF RESILIENTLY MOUNTED CASTERS AT EACH CORNER THEREOF TO SUPPORT THE WHEELCHAIR FROM THE GROUND, AND A RESILIENTLY MOUNTED DRIVE WHEEL MOUNTED FROM AN X-SHAPED FRAME AT THE CENTER OF EACH SIDE THEREOF SO THAT THE DRIVE WHEEL IS EQUALLY RESILIENTLY APPLIED TO THE GROUND, A BRAKE MECHANISM THAT IS DISPOSED IN FIXED RELATION TO THE SHAFT OF THE DRIVE WHEEL SO THAT THE BRAKE FORCE IS SUBSTANTIALLY CONSTANTLY APPLIED THROUGHOUT, A PAIR OF SEAT SECTIONS BEING PIVOTALLY MOUNTED AT THE OUTER EDGES THEREOF ON THE BOX FRAME, A CYLINDER AND PISTON ARRANGEMENT HAVING ONE END MOUNTED AT THE LEFT
Claim 2
Dependent Claim
124 words
A FOLDING WHEELCHAIR COMPRISING A SQUARE BOX FRAME HAVING THE LEFT AND RIGHT SIDES THEREOF TELESCOPICALLY ENGAGED TO EACH OTHER FOR COLLAPSING, A SET OF RESILIENTLY MOUNTED CASTERS AT EACH CORNER THEREOF TO SUPPORT THE WHEELCHAIR FROM THE GROUND, AND A RESILIENTLY MOUNTED DRIVE WHEEL MOUNTED FROM AN X-SHAPED FRAME AT THE CENTER OF EACH SIDE THEREOF SO THAT THE DRIVE WHEEL IS EQUALLY RESILIENTLY APPLIED TO THE GROUND, A BRAKE MECHANISM THAT IS DISPOSED IN FIXED RELATION TO THE SHAFT OF THE DRIVE WHEEL SO THAT THE BRAKE FORCE IS SUBSTANTIALLY CONSTANTLY APPLIED THROUGHOUT, A PAIR OF SEAT SECTIONS BEING PIVOTALLY MOUNTED AT THE OUTER EDGES THEREOF ON THE BOX FRAME, A CYLINDER AND PISTON ARRANGEMENT HAVING ONE END MOUNTED AT THE LEFT
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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) | 1970-08-21 | 1971-02-20 | 1971-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-08-21 | 1975-02-20 | 1975-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-08-21 | 1979-02-20 | 1979-08-22 | $7700.00 | Window Closed / Lapsed |