US2794166A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Walking sticks for the blind
Assignee: Individual
•
Filing: 1954-05-04
•
Granted: 1957-05-28
•
Expires: 1974-05-04
Abstract
No abstract record available.
Inventors
- 👤 William S Ferdon
- 👤 William V Ferdon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:56
CPC Classifications
A; A61; A61H; A61H3/00; A61H3/06; A61H3/061; A61H3/068
Claims Analysis
Total Claims: 0
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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) | 1960-05-27 | 1960-11-26 | 1961-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-05-27 | 1964-11-26 | 1965-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-05-27 | 1968-11-26 | 1969-05-28 | $7700.00 | Window Closed / Lapsed |