US2530544A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Walking chair for invalids
Assignee: Individual
•
Filing: 1949-03-09
•
Granted: 1950-11-21
•
Expires: 1969-03-09
Abstract
No abstract record available.
Inventors
- 👤 Otto R Schwantes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:37
CPC Classifications
A; A61; A61H; A61H3/00; A61H3/04; A61H2003/046; A61H2201/00; A61H2201/16; A61H2201/1602; A61H2201/1628; A61H2201/1633; Y; Y10; Y10S; Y10S297/00; Y10S297/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2374182A
Cited
US2433969A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-11-20 | 1954-05-22 | 1954-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-20 | 1958-05-22 | 1958-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-20 | 1962-05-22 | 1962-11-21 | $7700.00 | Window Closed / Lapsed |