Patent US3300685A successfully refreshed from Google Patents.
US3300685A
Expired / Lapsed
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Static overcurrent relay
Assignee: ABB Inc USA
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Filing: 1963-01-04
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Granted: 1967-01-24
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Expires: 1983-01-04
Abstract
No abstract record available.
Inventors
- 👤 Stanley E Zocholl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:24
CPC Classifications
H; H02; H02H; H02H6/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
103 words
STATIC OVERCURRENT RELAY MEANS FOR USE IN OPERATING A TRIPPING MEANS TO PROTECT A CIRCUIT FROM OVERHEATING COMPRISING FEEDBACK AMPLIFIER MEANS HAVING A CAPACITIVE FEEDBACK PATH FOR ELECTRONICALLY SIMULATING THE HEAT EQUATION RELATING TEMPERATURE RISE DUE TO CURRENT FLOW IN A CONDUCTOR; FIRST MEANS FOR GENERATING A FIRST VOLTAGE SIGNAL LINEARLY RELATED TO THE CURRENT FLOWING IN THE CIRCUIT BEING PROTECTED; THE OUTPUT OF SAID FIRST MEANS BEING CONNECTED TO SAID FEEDBACK AMPLIFIER MEANS; SHAPING CIRCUIT MEANS CONNECTED BETWEEN SAID FIRST MEANS AND SAID FEEDBACK AMPLIFIER MEANS FOR GENERATING AN OUTPUT SIGNAL WHICH IS A NON-LINEAR FUNCTION OF SAID FIRST VOLTAGE SIGNAL TO
Claim 2
Dependent Claim
103 words
STATIC OVERCURRENT RELAY MEANS FOR USE IN OPERATING A TRIPPING MEANS TO PROTECT A CIRCUIT FROM OVERHEATING COMPRISING FEEDBACK AMPLIFIER MEANS HAVING A CAPACITIVE FEEDBACK PATH FOR ELECTRONICALLY SIMULATING THE HEAT EQUATION RELATING TEMPERATURE RISE DUE TO CURRENT FLOW IN A CONDUCTOR; FIRST MEANS FOR GENERATING A FIRST VOLTAGE SIGNAL LINEARLY RELATED TO THE CURRENT FLOWING IN THE CIRCUIT BEING PROTECTED; THE OUTPUT OF SAID FIRST MEANS BEING CONNECTED TO SAID FEEDBACK AMPLIFIER MEANS; SHAPING CIRCUIT MEANS CONNECTED BETWEEN SAID FIRST MEANS AND SAID FEEDBACK AMPLIFIER MEANS FOR GENERATING AN OUTPUT SIGNAL WHICH IS A NON-LINEAR FUNCTION OF SAID FIRST VOLTAGE SIGNAL TO
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-01-23 | 1970-07-25 | 1971-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-23 | 1974-07-25 | 1975-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-23 | 1978-07-25 | 1979-01-24 | $7700.00 | Window Closed / Lapsed |