US2669987A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Medical oscillator
Assignee: M SIDNEY HEDEEN
•
Filing: 1950-08-07
•
Granted: 1954-02-23
•
Expires: 1970-08-07
Abstract
No abstract record available.
Inventors
- 👤 Tonkin Albert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:42
CPC Classifications
A; A61; A61H; A61H9/00; A61H9/005; A61H9/0078; A61H2201/00; A61H2201/02; A61H2201/0207; A61H2201/0221; A61H2201/0228; A61H2201/0242; A61H2201/025
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1147560A
Cited
US1608239A
Cited
US1772310A
Cited
US1898652A
Cited
US1913347A
Cited
US2361242A
Cited
US2543284A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-02-22 | 1957-08-24 | 1958-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-02-22 | 1961-08-24 | 1962-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-02-22 | 1965-08-24 | 1966-02-23 | $7700.00 | Window Closed / Lapsed |