US3199087A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Latching circuit
Assignee: International Business Machines Corp
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Filing: 1960-12-30
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Granted: 1965-08-03
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Expires: 1980-12-30
Abstract
No abstract record available.
Inventors
- 👤 Henry R Foglia
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:33
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/04; G; G11; G11C; G11C17/00; G11C17/14; G11C17/16; H03; H03K; H03K3/00; H03K3/02; H03K3/313
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
170 words
A LATCHING CIRCUIT COMPRISING FIRST AND SECOND RESISTANCE MEANS SERIALLY CONNECTED, MEANS FOR ENERGIZING SAID FIRST AND SECOND RESISTANCE MEANS, SAID FIRST MEANS BEING SEMICONDUCTIVE AND HAVING A REGION WHEN ENERGIZED EXHIBITING A FIRST LEVEL OF CONDUCTIVITY AT A GIVEN AMBIENT TEMPERATURE AND A SECOND HIGHER LEVEL OF CONDUCTIVITY AT A DIFFERENT AMBIENT TEMPERATURE, SAID REGION HAVING SUBSTANTIALLY LINEAR CONDUCTIVITY VARIATION, SAID SECOND MEANS HAVING A HIGHER CONDUCTIVITY THAN SAID FIRST MEANS AT SAID GIVEN AMBIENT TEMPERATURE, AND SAID FIRST MEANS RESPONDING TO EXTERNAL IRRADIATION, SO THAT SAID CIRCUIT IS LATCHED INTO A SELF-SUSTAINING STATE OF OPERATION BY THE HEAT DISSIPATION OF SAID FIRST MEANS WHEN SAID DIFFERENT AMBIENT TEMPERATURE IS ACHIEVED, SAID FIRST MEANS BEING OPERATED WITHIN SAID REGION, SAID FIRST AND SECOND TEMPERATURES BEING WITHIN THE SAID LINEAR CONDUCTIVITY VARIATION REGION, AND MEANS FOR INSULATING SAID FIRST MEANS TO MAINTAIN AN EQUILIBRIUM STATE BETWEEN THE HEAT GENERATED BY SAID FIRST MEANS AND THE HEAT DISSIPATED BY IT WHEN SAID CIRCUIT IS LATCHED INTO SAID SELF-SUSTAINING STATE OF OPERATION.
Claim 2
Dependent Claim
170 words
A LATCHING CIRCUIT COMPRISING FIRST AND SECOND RESISTANCE MEANS SERIALLY CONNECTED, MEANS FOR ENERGIZING SAID FIRST AND SECOND RESISTANCE MEANS, SAID FIRST MEANS BEING SEMICONDUCTIVE AND HAVING A REGION WHEN ENERGIZED EXHIBITING A FIRST LEVEL OF CONDUCTIVITY AT A GIVEN AMBIENT TEMPERATURE AND A SECOND HIGHER LEVEL OF CONDUCTIVITY AT A DIFFERENT AMBIENT TEMPERATURE, SAID REGION HAVING SUBSTANTIALLY LINEAR CONDUCTIVITY VARIATION, SAID SECOND MEANS HAVING A HIGHER CONDUCTIVITY THAN SAID FIRST MEANS AT SAID GIVEN AMBIENT TEMPERATURE, AND SAID FIRST MEANS RESPONDING TO EXTERNAL IRRADIATION, SO THAT SAID CIRCUIT IS LATCHED INTO A SELF-SUSTAINING STATE OF OPERATION BY THE HEAT DISSIPATION OF SAID FIRST MEANS WHEN SAID DIFFERENT AMBIENT TEMPERATURE IS ACHIEVED, SAID FIRST MEANS BEING OPERATED WITHIN SAID REGION, SAID FIRST AND SECOND TEMPERATURES BEING WITHIN THE SAID LINEAR CONDUCTIVITY VARIATION REGION, AND MEANS FOR INSULATING SAID FIRST MEANS TO MAINTAIN AN EQUILIBRIUM STATE BETWEEN THE HEAT GENERATED BY SAID FIRST MEANS AND THE HEAT DISSIPATED BY IT WHEN SAID CIRCUIT IS LATCHED INTO SAID SELF-SUSTAINING STATE OF OPERATION.
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) | 1968-08-02 | 1969-02-01 | 1969-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-02 | 1973-02-01 | 1973-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-02 | 1977-02-01 | 1977-08-03 | $7700.00 | Window Closed / Lapsed |