Patent US2439857A successfully refreshed from Google Patents.
US2439857A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Single knob oximeter having selective control means for multiple channels
Assignee: United States, WAR, Secretary of
•
Filing: 1947-04-04
•
Granted: 1948-04-20
•
Expires: 1967-04-04
Abstract
No abstract record available.
Inventors
- 👤 Glenn A Millikan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:20
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/25; G01N21/251; G01N21/253
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1951-04-20 | 1951-10-20 | 1952-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-04-20 | 1955-10-20 | 1956-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-04-20 | 1959-10-20 | 1960-04-20 | $7700.00 | Window Closed / Lapsed |