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Patent US3546392A successfully refreshed from Google Patents.
US3546392A
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US
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Coordinate matrix arrangement for supervision of loop conditions and for discerning loop resistances in a plurality of loops
Assignee: International Standard Electric Corp
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Filing: 1967-04-20
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Granted: 1970-12-08
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Expires: 1987-04-20
Abstract
No abstract record available.
Inventors
- 👤 Eberhard Herter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:02
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/42; H04M; H04M1/00; H04M1/26; H04M1/515; H04M3/00; H04M3/22; H04M3/2272; H04Q1/00; H04Q1/18; H04Q1/30; H04Q1/38
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) | 1973-12-07 | 1974-06-08 | 1974-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-12-07 | 1978-06-08 | 1978-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-12-07 | 1982-06-08 | 1982-12-08 | $7700.00 | Window Closed / Lapsed |