Patent US3330370A successfully refreshed from Google Patents.
US3330370A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stair climbing device
Assignee: Individual
•
Filing: 1965-09-01
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Granted: 1967-07-11
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Expires: 1985-09-01
Abstract
No abstract record available.
Inventors
- 👤 John C Morton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:05
CPC Classifications
B; B62; B62B; B62B5/00; B62B5/02; B62B5/023
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
124 words
A HAND TRUCK COMPRISING A FRAME WITH A PAIR OF WHEELS TO ROTATABLY SUPPORT SAID FRAME, AN ENDLESS BELT MOUNTED ALONG THE BACK OF SAID FRAME, ROLLERS MOUNTED TO SAID BELT, BELT SUPPORT MEANS ROTATABLY SUPPORTING SAID BELT AT OPPOSITE ENDS, ONE OF SAID SUPPORTS BEING LOCATED BELOW ANOTHER OF SAID SUPPORTS WITH SAID LOWER SUPPORT BEING LOCATED ADJACENT SAID WHEELS, SAID ROLLERS BEING ADAPTED TO PROJECT OUTWARD AND MOVE DOWNWARD ON SAID BELT TO ENGAGE A STEP OF A FLIGHT OF STAIRS TO RAISE SAID TRUCK UP THE STEP OF A FLIGHT OF STAIRS, SAID ROLLERS ADAPTED TO SWING BELOW THE LOWER EDGE OF SAID WHEELS ABOUT THE AXIS OF SAID LOWER SUPPORT MEANS TO SWING SAID TRUCK UP AND ONTO SAID STEPS.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-07-10 | 1971-01-09 | 1971-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-10 | 1975-01-09 | 1975-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-10 | 1979-01-09 | 1979-07-11 | $7700.00 | Window Closed / Lapsed |