Patent US3219997A successfully refreshed from Google Patents.
US3219997A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Analog-to-digital converter
Assignee: California Institute Research Foundation
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Filing: 1962-02-26
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Granted: 1965-11-23
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Expires: 1982-02-26
Abstract
No abstract record available.
Inventors
- 👤 Lanny L Lewyn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:45
CPC Classifications
H; H03; H03M; H03M1/00; H03M1/12; H03M1/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
173 words
AN ANALOG-TO-DIGITAL CONVERTER COMPRISING A PLURALITY OF NEGATIVE RESISTANCE ELEMENTS EACH HAVING THE CHARACTERISTIC THAT FOR A CONSTANT CURRENT APPLIED THEREACROSS THE ELEMENT HAS TWO STABLE STATES, THE VOLTAGE ACROSS EACH SAID ELEMENT BEING DIFFERENT WHENI IT IS IN ITS SECOND STABLE STATE THAT WHEN IT IS IN ITS FIRST STABLE STATE, AND SAID ELEMENT BEING CAPABLE OF BEING TRIGGERED FROM ONE TO THE OTHER OF ITS STABLE STATES BY ALTERING THE VOLTAGE APPLIED THEREACROSS BY A PREDETERMINED AMOUNT, MEANS CONNECTING SAID PLURALITY OF NEGATIVE RESISTANCE ELEMENTS IN SERIES, A SEPARATE MEANS FOR DETECTING THE OUTPUT OF ONE OF SAID NEGATIVE RESISTANCE ELEMENTS WHEN IT IS TRANSFERRED FROM ITS FIRST TO ITS SECOND STATE OF STABILITY FOR EACH ONE OF SAID NEGATIVE RESISTANCE ELEMENTS, MEANS FOR CONNECTING EACH ONE OF SAID MEANS FOR DETECTING TO A DIFFERENT ONE OF SAID NEGATIVE RESISTANCE ELEMENTS, MEANS FOR APPLYING AN UNKNOWN SIGNAL WHOSE AMPLITUDE IS DESIRED TO BE DIGITALIZED ACROSS ALL SAID NEGATIVE RESISTANCE ELEMENTS, AND MEANS FOR UTILIZING THE OUTPUTS OF SAID MEANS FOR DETECTING.
Claim 2
Dependent Claim
173 words
AN ANALOG-TO-DIGITAL CONVERTER COMPRISING A PLURALITY OF NEGATIVE RESISTANCE ELEMENTS EACH HAVING THE CHARACTERISTIC THAT FOR A CONSTANT CURRENT APPLIED THEREACROSS THE ELEMENT HAS TWO STABLE STATES, THE VOLTAGE ACROSS EACH SAID ELEMENT BEING DIFFERENT WHENI IT IS IN ITS SECOND STABLE STATE THAT WHEN IT IS IN ITS FIRST STABLE STATE, AND SAID ELEMENT BEING CAPABLE OF BEING TRIGGERED FROM ONE TO THE OTHER OF ITS STABLE STATES BY ALTERING THE VOLTAGE APPLIED THEREACROSS BY A PREDETERMINED AMOUNT, MEANS CONNECTING SAID PLURALITY OF NEGATIVE RESISTANCE ELEMENTS IN SERIES, A SEPARATE MEANS FOR DETECTING THE OUTPUT OF ONE OF SAID NEGATIVE RESISTANCE ELEMENTS WHEN IT IS TRANSFERRED FROM ITS FIRST TO ITS SECOND STATE OF STABILITY FOR EACH ONE OF SAID NEGATIVE RESISTANCE ELEMENTS, MEANS FOR CONNECTING EACH ONE OF SAID MEANS FOR DETECTING TO A DIFFERENT ONE OF SAID NEGATIVE RESISTANCE ELEMENTS, MEANS FOR APPLYING AN UNKNOWN SIGNAL WHOSE AMPLITUDE IS DESIRED TO BE DIGITALIZED ACROSS ALL SAID NEGATIVE RESISTANCE ELEMENTS, AND MEANS FOR UTILIZING THE OUTPUTS OF SAID MEANS FOR DETECTING.
References Cited (Backward Citations)
US3041469A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-11-22 | 1969-05-24 | 1969-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-22 | 1973-05-24 | 1973-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-22 | 1977-05-24 | 1977-11-23 | $7700.00 | Window Closed / Lapsed |