US1919858A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of determining and recording oxygen content of liquid or gases
Assignee: Individual
•
Filing: 1931-07-21
•
Granted: 1933-07-25
•
Expires: 1951-07-21
Abstract
No abstract record available.
Inventors
- 👤 Pettingill Clark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:47
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/75; G01N21/77; G01N21/78; G01N21/783; Y; Y10; Y10T; Y10T436/00; Y10T436/11; Y10T436/115831; Y10T436/20; Y10T436/207497; Y10T436/209163
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) | 1936-07-24 | 1937-01-23 | 1937-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-07-24 | 1941-01-23 | 1941-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-07-24 | 1945-01-23 | 1945-07-25 | $7700.00 | Window Closed / Lapsed |