US2446299A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Interlocking relay
Assignee: Guardian Electric Manufacturing Co
•
Filing: 1944-02-14
•
Granted: 1948-08-03
•
Expires: 1964-02-14
Abstract
No abstract record available.
Inventors
- 👤 Marvin G Nelsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:18
CPC Classifications
H; H02; H02P; H02P3/00; H02P3/06; H02P3/08; H02P3/12; H01; H01H; H01H51/00; H01H51/02; H01H51/04; H01H51/06; H01H51/10; H01H50/00; H01H50/16; H01H50/18; H01H50/32; H01H50/323
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US489674A
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US811773A
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US965671A
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US1291039A
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US1550611A
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US1522766A
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US1486386A
Cited
US1614192A
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GB267502A
Cited
US1954365A
Cited
US1983137A
Cited
US2396972A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-08-03 | 1952-02-02 | 1952-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-08-03 | 1956-02-02 | 1956-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-08-03 | 1960-02-02 | 1960-08-03 | $7700.00 | Window Closed / Lapsed |