Patent US3349255A successfully refreshed from Google Patents.
US3349255A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Delay multivibrator
Assignee: Unisys Corp
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Filing: 1965-04-20
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Granted: 1967-10-24
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Expires: 1985-04-20
Abstract
No abstract record available.
Inventors
- 👤 John A Mcavoy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:00
CPC Classifications
H; H03; H03K; H03K3/00; H03K3/02; H03K3/26; H03K3/28; H03K3/281; H03K3/286
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
122 words
A DELAY CIRCUIT COMPRISING A BISTABLE CIRCUIT, INPUT TRIGGERING MEANS FOR SWITCHING SAID BISTABLE CIRCUIT FROM ITS FIRST TO ITS SECOND STATE, A UNIJUNCTION TRANSISTOR HAVING A CONTROL ELECTRODE AND AN OUTPUT ELECTRODE, SERIES-CONNECTED RC TIMING MEANS INDEPENDENT OF SAID BISTABLE CIRCUIT AND ATTACHED TO THE CONTROL ELECTRODE OF SAID UNIJUNCTION TRANSISTOR, DIODE MEANS COUPLING SAID TIMING MEANS TO SAID BISTABLE CIRCUIT FOR CLAMPING THE VOLTAGE OF SAID TIMING MEANS BELOW THE FIRING VOLTAGE OF SAID UNIJUNCTION TRANSISTOR WHILE SAID BISTABLE CIRCUIT IS IN ITS FIRST STATE AND FOR RELEASING SAID TIMING MEANS TO CHARGE AND FIRE SAID UNIJUNCTION TRANSISTOR FOR PRODUCING A PULSE AT SAID OUTPUT TERMINAL A PREDETERMINED TIME THEREAFTER WHEN SAID BISTABLE CIRCUIT IS SWITCHED TO ITS SECOND STATE,
Claim 2
Dependent Claim
122 words
A DELAY CIRCUIT COMPRISING A BISTABLE CIRCUIT, INPUT TRIGGERING MEANS FOR SWITCHING SAID BISTABLE CIRCUIT FROM ITS FIRST TO ITS SECOND STATE, A UNIJUNCTION TRANSISTOR HAVING A CONTROL ELECTRODE AND AN OUTPUT ELECTRODE, SERIES-CONNECTED RC TIMING MEANS INDEPENDENT OF SAID BISTABLE CIRCUIT AND ATTACHED TO THE CONTROL ELECTRODE OF SAID UNIJUNCTION TRANSISTOR, DIODE MEANS COUPLING SAID TIMING MEANS TO SAID BISTABLE CIRCUIT FOR CLAMPING THE VOLTAGE OF SAID TIMING MEANS BELOW THE FIRING VOLTAGE OF SAID UNIJUNCTION TRANSISTOR WHILE SAID BISTABLE CIRCUIT IS IN ITS FIRST STATE AND FOR RELEASING SAID TIMING MEANS TO CHARGE AND FIRE SAID UNIJUNCTION TRANSISTOR FOR PRODUCING A PULSE AT SAID OUTPUT TERMINAL A PREDETERMINED TIME THEREAFTER WHEN SAID BISTABLE CIRCUIT IS SWITCHED TO ITS SECOND STATE,
References Cited (Backward Citations)
US2636984A
Cited
US2986652A
Cited
US2997665A
Cited
US3049625A
Cited
US3225221A
Cited
US3299288A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-10-23 | 1971-04-24 | 1971-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-23 | 1975-04-24 | 1975-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-23 | 1979-04-24 | 1979-10-24 | $7700.00 | Window Closed / Lapsed |