US3296520A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrically controlled variable resistance
Assignee: Individual
•
Filing: 1962-10-26
•
Granted: 1967-01-03
•
Expires: 1982-10-26
Abstract
No abstract record available.
Inventors
- 👤 William F Griffith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:15
CPC Classifications
H; H03; H03G; H03G11/00; H03G11/02; H03G1/00; H03G1/0005; H03G1/0035; H03G1/0052; H03G1/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
126 words
AN ELECTRICALLY CONTROLLED VARIABLE RESISTANCE NETWORK COMPRISING: (A) FIRST AND SECOND ZENER DIODE MEANS, EACH MEANS HAVING A PAIR OF ZENER DIODES CONNECTED IN REVERSE WITH RESPECT TO ONE ANOTHER; (B) EACH ZENER DIODE MEANS HAVING A NOMINAL REVERSE CURRENT OF AT LEAST FIVE MICROAMPERES AT ONE VOLT AT 25*C.; (C) FIRST AND SECOND SIGNAL TERMINALS; (D) SAID FIRST AND SECOND ZENER DIODE MEANS BEING CONNECTED IN SERIES WITH EACH OTHER BETWEEN SAID FIRST AND SECOND SIGNAL TERMINALS TO PROVIDE A LINEARLY VARIABLE RESISTANCE BETWEEN SAID FIRST AND SECOND SIGNAL TERMINALS OVER A GIVEN RANGE OF SIGNAL VOLTAGE DROP BETWEEN SAID FIRST AND SECOND SIGNAL TERMINALS; AND (E) A SOURCE OF BIAS CURRENT CONNECTED TO SAID FIRST AND SECOND ZENER DIODE MEANS TO VARY SAID RESISTANCE.
Claim 2
Dependent Claim
126 words
AN ELECTRICALLY CONTROLLED VARIABLE RESISTANCE NETWORK COMPRISING: (A) FIRST AND SECOND ZENER DIODE MEANS, EACH MEANS HAVING A PAIR OF ZENER DIODES CONNECTED IN REVERSE WITH RESPECT TO ONE ANOTHER; (B) EACH ZENER DIODE MEANS HAVING A NOMINAL REVERSE CURRENT OF AT LEAST FIVE MICROAMPERES AT ONE VOLT AT 25*C.; (C) FIRST AND SECOND SIGNAL TERMINALS; (D) SAID FIRST AND SECOND ZENER DIODE MEANS BEING CONNECTED IN SERIES WITH EACH OTHER BETWEEN SAID FIRST AND SECOND SIGNAL TERMINALS TO PROVIDE A LINEARLY VARIABLE RESISTANCE BETWEEN SAID FIRST AND SECOND SIGNAL TERMINALS OVER A GIVEN RANGE OF SIGNAL VOLTAGE DROP BETWEEN SAID FIRST AND SECOND SIGNAL TERMINALS; AND (E) A SOURCE OF BIAS CURRENT CONNECTED TO SAID FIRST AND SECOND ZENER DIODE MEANS TO VARY SAID RESISTANCE.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-01-02 | 1970-07-04 | 1971-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-02 | 1974-07-04 | 1975-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-02 | 1978-07-04 | 1979-01-03 | $7700.00 | Window Closed / Lapsed |