US2622471A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil testing device
Assignee: Individual
•
Filing: 1950-07-08
•
Granted: 1952-12-23
•
Expires: 1970-07-08
Abstract
No abstract record available.
Inventors
- 👤 Sparks Joseph Erwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:28
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/26; G01N33/28; G01N33/2888
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US672184A
Cited
US1416863A
Cited
US2176618A
Cited
US2087714A
Cited
US2245557A
Cited
US2302224A
Cited
US2253356A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-12-23 | 1956-06-23 | 1956-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-23 | 1960-06-23 | 1960-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-23 | 1964-06-23 | 1964-12-23 | $7700.00 | Window Closed / Lapsed |