Patent US3448749A successfully refreshed from Google Patents.
US3448749A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-skid attachment for the ground-engaging end of canes,crutches,and the like
Assignee: Individual
•
Filing: 1968-05-22
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Granted: 1969-06-10
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Expires: 1988-05-22
Abstract
No abstract record available.
Inventors
- 👤 Walter Stark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:05
CPC Classifications
A; A45; A45B; A45B9/00; A45B9/04; A61; A61H; A61H3/00; A61H3/02; A61H3/0288
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US404303A
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US1304978A
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US1164608A
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US2437076A
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US2501890A
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US2682275A
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US2667885A
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US2856943A
Cited
US3376880A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-09 | 1972-12-09 | 1973-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-09 | 1976-12-09 | 1977-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-09 | 1980-12-09 | 1981-06-10 | $7700.00 | Window Closed / Lapsed |