US2641634A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phase comparison electronic relay protective system
Assignee: Individual
•
Filing: 1950-06-29
•
Granted: 1953-06-09
•
Expires: 1970-06-29
Abstract
No abstract record available.
Inventors
- 👤 Donald J Marihart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:30
CPC Classifications
H; H02; H02H; H02H3/00; H02H3/26; H02H3/28; H02H3/30; H02H3/302
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2213294A
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US2287926A
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US2529723A
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US2406616A
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US2408868A
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US2406617A
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US2487603A
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US2594371A
Cited
US2558085A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-08 | 1956-12-08 | 1957-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-08 | 1960-12-08 | 1961-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-08 | 1964-12-08 | 1965-06-09 | $7700.00 | Window Closed / Lapsed |