Patent US2019871A successfully refreshed from Google Patents.
US2019871A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous oxygen recorder
Assignee: Individual
•
Filing: 1933-08-26
•
Granted: 1935-11-05
•
Expires: 1953-08-26
Abstract
No abstract record available.
Inventors
- 👤 Pettingill Clark
- 👤 Elmer J Barlow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:10
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/75; G01N21/77; G01N21/78; Y; Y10; Y10T; Y10T436/00; Y10T436/11; Y10T436/117497; Y10T436/20; Y10T436/207497
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) | 1938-11-04 | 1939-05-06 | 1939-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-11-04 | 1943-05-06 | 1943-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-11-04 | 1947-05-06 | 1947-11-05 | $7700.00 | Window Closed / Lapsed |