Patent EP0489496A1 successfully refreshed from Google Patents.
US2318364A
Expired / Lapsed
US
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Pilot-wire supervisory circuits
Assignee: Westinghouse Electric Corp
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Filing: 1940-09-10
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Granted: 1943-05-04
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Expires: 1960-09-10
Abstract
No abstract record available.
Inventors
- 👤 Myron A Bostwick
- 👤 Roy M Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:07
CPC Classifications
H; H02; H02H; H02H1/00; H02H1/0061; H02H1/0084
Claims Analysis
Total Claims: 0
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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) | 1946-05-03 | 1946-11-02 | 1947-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1950-05-03 | 1950-11-02 | 1951-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1954-05-03 | 1954-11-02 | 1955-05-04 | $7700.00 | Window Closed / Lapsed |