Patent US2580888A successfully refreshed from Google Patents.
US2580888A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Walking aid
Assignee: Individual
•
Filing: 1948-05-03
•
Granted: 1952-01-01
•
Expires: 1968-05-03
Abstract
No abstract record available.
Inventors
- 👤 James C Burkett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:18
CPC Classifications
A; A61; A61H; A61H3/00; A61H3/02; A61H2003/002
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US367224A
Cited
US879640A
Cited
US869128A
Cited
US921023A
Cited
US1035760A
Cited
US1509157A
Cited
US1653024A
Cited
US2116730A
Cited
US2151293A
Cited
US2311049A
Cited
US2429409A
Cited
US2388778A
Cited
US2373045A
Cited
US2383786A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-12-31 | 1955-07-02 | 1956-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-31 | 1959-07-02 | 1960-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-31 | 1963-07-02 | 1964-01-01 | $7700.00 | Window Closed / Lapsed |