US2218330A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ventilator
Assignee: AT&T Inc
•
Filing: 1939-01-10
•
Granted: 1940-10-15
•
Expires: 1959-01-10
Abstract
No abstract record available.
Inventors
- 👤 Oscar C Ellason
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:13
CPC Classifications
F; F24; F24F; F24F11/00; F24F11/89; F24F1/00; F24F1/0007; F24F1/0035; F24F1/0018; F24F1/0022; F24F1/0033; F24F2221/00; F24F2221/20; Y; Y10; Y10T; Y10T137/00; Y10T137/1624; Y10T137/1797; Y10T74/00; Y10T74/20; Y10T74/20576; Y10T74/20636; Y10T74/2066
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1943-10-15 | 1944-04-15 | 1944-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-10-15 | 1948-04-15 | 1948-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-10-15 | 1952-04-15 | 1952-10-15 | $7700.00 | Window Closed / Lapsed |