Patent US2429072A successfully refreshed from Google Patents.
US2429072A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus to detect changes of voltages
Assignee: Hitachi Rail STS USA Inc
•
Filing: 1945-05-24
•
Granted: 1947-10-14
•
Expires: 1965-05-24
Abstract
No abstract record available.
Inventors
- 👤 Willard P Place
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:25
CPC Classifications
G; G01; G01P; G01P15/00; G01P15/16; G01P15/165
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1096942A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-10-13 | 1951-04-14 | 1951-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-10-13 | 1955-04-14 | 1955-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-10-13 | 1959-04-14 | 1959-10-14 | $7700.00 | Window Closed / Lapsed |