US3104112A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stair climbing wheel chair
Assignee: Individual
•
Filing: 1962-07-02
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Granted: 1963-09-17
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Expires: 1982-07-02
Abstract
No abstract record available.
Inventors
- 👤 Jesse W Crail
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:13
CPC Classifications
A; A61; A61G; A61G5/00; A61G5/06; A61G5/061; A61G5/08; A61G5/0808; A61G5/0816
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
204 words
IN AN OCCUPANT-PROPELLED FOLDING WHEEL CHAIR OF THE TYPE IN WHICH SIDE FRAMES ARE SUPPORTED ON FOLDING CROSSBAR MEANS, EACH SIDE FRAME HAVING A FRONT CASTER AND A REAR MAIN WHEEL SUFFICIENTLY LARGE IN DIAMETER TO ROLL OVER NORMAL STAIR STEPS, AND IN WHICH THE OCCUPANT CAN PROPEL THE CHAIR BY HAND-OPERATED MEANS FOR DRIVING SAID MAIN WHEELS, A STAIR CLIMBING MECHANISM WHICH INCLUDES: A PAIR OF ARMS, ONE CARRIED ON EACH OF SAID SIDE FRAMES, EACH SAID ARM BEING PIVOTED AT ITS REARWARD END COAXIALLY WITH ONE OF SAID MAIN WHEELS TO PERMIT THE FORWARD END OF SAID ARM TO SWING BETWEEN A RAISED AND LOWERED POSITION; A PAIR OF STAIR-CLIMBING WHEELS, ONE ROTATABLY MOUNTED ON THE FORWARD END OF EACH OF SAID ARMS, SAID WHEELS HAVING A DIAMETER SMALLER THAN SAID MAIN WHEELS BUT LARGE ENOUGH TO ROLL OVER NORMAL STAIR STEPS; A TRANSVERSE BRACE MEMBER BETWEEN SAID ARMS, SAID BRACE MEMBER BEING DISPOSED SUFFICIENTLY FORWARD TO CLEAR THE SIDE FRAMES OF SAID WHEEL CHAIR DURING SWINGING MOVEMENT OF SAID ARMS, AND SAID BRACE MEMBER BEING FOLDABLE TO COOPERATE WITH THE FOLDING OF SAID WHEEL CHAIR; A PAIR OF LINKAGE MEANS, ONE ON EACH OF SAID SIDE FRAMES, EACH OF SAID LINKAGE
Claim 2
Dependent Claim
204 words
IN AN OCCUPANT-PROPELLED FOLDING WHEEL CHAIR OF THE TYPE IN WHICH SIDE FRAMES ARE SUPPORTED ON FOLDING CROSSBAR MEANS, EACH SIDE FRAME HAVING A FRONT CASTER AND A REAR MAIN WHEEL SUFFICIENTLY LARGE IN DIAMETER TO ROLL OVER NORMAL STAIR STEPS, AND IN WHICH THE OCCUPANT CAN PROPEL THE CHAIR BY HAND-OPERATED MEANS FOR DRIVING SAID MAIN WHEELS, A STAIR CLIMBING MECHANISM WHICH INCLUDES: A PAIR OF ARMS, ONE CARRIED ON EACH OF SAID SIDE FRAMES, EACH SAID ARM BEING PIVOTED AT ITS REARWARD END COAXIALLY WITH ONE OF SAID MAIN WHEELS TO PERMIT THE FORWARD END OF SAID ARM TO SWING BETWEEN A RAISED AND LOWERED POSITION; A PAIR OF STAIR-CLIMBING WHEELS, ONE ROTATABLY MOUNTED ON THE FORWARD END OF EACH OF SAID ARMS, SAID WHEELS HAVING A DIAMETER SMALLER THAN SAID MAIN WHEELS BUT LARGE ENOUGH TO ROLL OVER NORMAL STAIR STEPS; A TRANSVERSE BRACE MEMBER BETWEEN SAID ARMS, SAID BRACE MEMBER BEING DISPOSED SUFFICIENTLY FORWARD TO CLEAR THE SIDE FRAMES OF SAID WHEEL CHAIR DURING SWINGING MOVEMENT OF SAID ARMS, AND SAID BRACE MEMBER BEING FOLDABLE TO COOPERATE WITH THE FOLDING OF SAID WHEEL CHAIR; A PAIR OF LINKAGE MEANS, ONE ON EACH OF SAID SIDE FRAMES, EACH OF SAID LINKAGE
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-09-16 | 1967-03-18 | 1967-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-09-16 | 1971-03-18 | 1971-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-09-16 | 1975-03-18 | 1975-09-17 | $7700.00 | Window Closed / Lapsed |