US2540425A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antifreeze indicator
Assignee: Individual
•
Filing: 1948-02-20
•
Granted: 1951-02-06
•
Expires: 1968-02-20
Abstract
No abstract record available.
Inventors
- 👤 Paul F Byrum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 03:52
CPC Classifications
F; F01; F01P; F01P11/00; F01P11/14; G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/06; G01N27/07
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1320036A
Cited
US1518211A
Cited
US1826886A
Cited
US1874911A
Cited
US2211394A
Cited
US2340641A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-02-05 | 1954-08-07 | 1955-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-05 | 1958-08-07 | 1959-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-05 | 1962-08-07 | 1963-02-06 | $7700.00 | Window Closed / Lapsed |