Patent US3237940A successfully refreshed from Google Patents.
US3237940A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety brake casters for walking aid
Assignee: Individual
•
Filing: 1963-10-22
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Granted: 1966-03-01
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Expires: 1983-10-22
Abstract
No abstract record available.
Inventors
- 👤 Auline S Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:25
CPC Classifications
A; A61; A61H; A61H3/00; A61H3/04; B; B60; B60B; B60B33/00; B60B33/04; B60B33/06; B62; B62B; B62B5/00; B62B5/04; A61H2003/046
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
76 words
AN INVALID WALKER COMPRISING A RIGID FRAME INCLUDING A PAIR OF SPACED, FIXED, HORIZONTAL HAND RAILS, THE SPACE BETWEEN THEM INSIDE THE FRAME BEING OPEN AND UNOBSTRUCTED, TO ACCOMMODATE THE OCCUPANT IN STANDING POSITION, CASTER WHEELS ON WHICH SAID FRAME IS MOUNTED, A BRAKE SHOE ARRANGED TO BEAR AGAINST EACH CASTER WHEEL, AND MEANS INTERCONNECTING SAID FRAME AND BRAKE SHOE WHEREBY DOWNWARD PRESSURE ON SAID HAND RAILS SERVES TO APPLY SAID BRAKE SHOES TO SAID WHEELS.
References Cited (Backward Citations)
US583728A
Cited
US2214176A
Cited
US2437778A
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US2630961A
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US2684734A
Cited
US2942698A
Cited
US2950121A
Cited
US3057638A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-02-28 | 1969-08-30 | 1970-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-28 | 1973-08-30 | 1974-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-28 | 1977-08-30 | 1978-03-01 | $7700.00 | Window Closed / Lapsed |