Patent US3077551A successfully refreshed from Google Patents.
US3077551A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transistor resistance monitor
Assignee: Individual
•
Filing: 1958-12-09
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Granted: 1963-02-12
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Expires: 1978-12-09
Abstract
No abstract record available.
Inventors
- 👤 Harold B Nelson
- 👤 Floyd R Scripture
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:52
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/52
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
155 words
IN COMBINATION WITH A CURRENT SOURCE AND A PAIR OF TRANSISTOR, HAVING GROUNDED EMITTER ELECTRODES, A PAIR OF PARALLEL CURRENT PATHS LEADING FROM SAID CURRENT SOURCE TO THE COLLECTOR ELECTRODES OF THE RESPECTIVE TRANSISTOR, THE FIRST OF SAID PATHS INCLUDING A RESISTANCE UNIT, THE SECOND INCLUDING A RELAY WINDING, AND A TEST COMPONENT SUBJECT TO PROGRESSIVE DETERIORATION, SAID TEST COMPONENT BEING CONNECTED TO THE BASE ELECTRODE OF THE FIRST OF SAID TRANSISTORS, AND NORMALLY OPERATING TO CAUSE SAID FIRST CURRENT PATH TO RECEIVE THE PREPONDERANCE OF THE CURRENT FLOWING FROM SAID CURRENT SOURCE, SO THAT THE CURRENT FLOWING FROM SAID SOURCE TO SAID RELAY WINDING IS INSUFFICIENT TO OPERATE THE RELAY, BUT BECOMES OF PROGRESSIVELY INCREASING MAGNITUDE AS THE PROGRESSIVE DETERIORATION OF SAID TEST COMPONENT REDUCES THE CURRENT FLOW IN SAID FIRST PATH AND CORRESPONDINGLY INCREASES THE CURRENT FLOW OF SAID RELAY WINDING, UNTIL EVENTUALLY SAID RELAY WINDING RECEIVES SUFFICIENT CURRENT TO OPERATE THE RELAY.
Claim 2
Dependent Claim
155 words
IN COMBINATION WITH A CURRENT SOURCE AND A PAIR OF TRANSISTOR, HAVING GROUNDED EMITTER ELECTRODES, A PAIR OF PARALLEL CURRENT PATHS LEADING FROM SAID CURRENT SOURCE TO THE COLLECTOR ELECTRODES OF THE RESPECTIVE TRANSISTOR, THE FIRST OF SAID PATHS INCLUDING A RESISTANCE UNIT, THE SECOND INCLUDING A RELAY WINDING, AND A TEST COMPONENT SUBJECT TO PROGRESSIVE DETERIORATION, SAID TEST COMPONENT BEING CONNECTED TO THE BASE ELECTRODE OF THE FIRST OF SAID TRANSISTORS, AND NORMALLY OPERATING TO CAUSE SAID FIRST CURRENT PATH TO RECEIVE THE PREPONDERANCE OF THE CURRENT FLOWING FROM SAID CURRENT SOURCE, SO THAT THE CURRENT FLOWING FROM SAID SOURCE TO SAID RELAY WINDING IS INSUFFICIENT TO OPERATE THE RELAY, BUT BECOMES OF PROGRESSIVELY INCREASING MAGNITUDE AS THE PROGRESSIVE DETERIORATION OF SAID TEST COMPONENT REDUCES THE CURRENT FLOW IN SAID FIRST PATH AND CORRESPONDINGLY INCREASES THE CURRENT FLOW OF SAID RELAY WINDING, UNTIL EVENTUALLY SAID RELAY WINDING RECEIVES SUFFICIENT CURRENT TO OPERATE THE RELAY.
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) | 1966-02-11 | 1966-08-13 | 1967-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-02-11 | 1970-08-13 | 1971-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-02-11 | 1974-08-13 | 1975-02-12 | $7700.00 | Window Closed / Lapsed |