US2516852A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crutch
Assignee: Individual
•
Filing: 1947-09-08
•
Granted: 1950-08-01
•
Expires: 1967-09-08
Abstract
No abstract record available.
Inventors
- 👤 William C Burry
- 👤 Alonzo B Christie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:50
CPC Classifications
A; A61; A61H; A61H3/00; A61H3/02; A61H3/0244; A61H2003/0255
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) | 1953-07-31 | 1954-01-30 | 1954-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-07-31 | 1958-01-30 | 1958-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-07-31 | 1962-01-30 | 1962-08-01 | $7700.00 | Window Closed / Lapsed |