US2442737A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical regulating apparatus
Assignee: Hitachi Rail STS USA Inc
•
Filing: 1945-10-06
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Granted: 1948-06-01
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Expires: 1965-10-06
Abstract
No abstract record available.
Inventors
- 👤 Walker Alec Hervey Bennett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:03
CPC Classifications
G; G05; G05F; G05F1/00; G05F1/10; G05F1/12; G05F1/32; G05F1/33
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1662889A
Cited
US1485076A
Cited
US1691022A
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US1753921A
Cited
US2079500A
Cited
US2067143A
Cited
US2066943A
Cited
US2331131A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-06-01 | 1951-12-01 | 1952-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-06-01 | 1955-12-01 | 1956-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-06-01 | 1959-12-01 | 1960-06-01 | $7700.00 | Window Closed / Lapsed |