Patent US3283057A successfully refreshed from Google Patents.
US3283057A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Keyboard oscillator circuit
Assignee: Seeburg Corp
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Filing: 1964-06-26
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Granted: 1966-11-01
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Expires: 1984-06-26
Abstract
No abstract record available.
Inventors
- 👤 Jr Richard H Campbell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:22
CPC Classifications
G; G10; G10H; G10H5/00; G10H5/02; G10H5/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
A KEYBOARD OPERATED TONE GENERATOR COMPRISING A UNIJUNCTION TRANSISTOR, A CAPACITOR CONNECTED ACROSS THE JUNCTION OF SAID TRANSISTOR, A CONTROLLED VARIBLE CHARGING CIRCUIT FOR SAID CAPACITOR SAID CHARGING CIRCUIT INCLUDING A CONSTANT CURRENT TRANSISTOR CONNECTED TO CHARGE SAID CAPACITOR AND A TRANSISTOR FEEDBACK CIRCUIT CONNECTED TO CONTROL SAID CONSTANT CURRENT TRNSISTOR TO SUPPLY A PREDETERMINED RANGE OF CURRENT VALUES, A KEYBOARD, AN ADJUSTABLE RESISTOR AND A PLURALITY OF FIXED RESISTORS PROPORTIONED ACCORDING TO THE NOTES OF SAID KEYB OARD CONNECTED IN SERIES ACROSS A REGULATED VOLTAGE SOURCE, A MEMORY CAPACITOR, SWITCH MEANS OPERATED BY THE KEYS OF SAID KEYBOARD TO CHARGE SAID MEMORY CAPACITOR TO THE VOLTAGE BETWEEN ADJACENT ONES OF SAID RESISTORS CORRESPONDING TO THE ACTUATED KEY OF SAID KEYBOARD, A CONNECTION FROM
Claim 2
Dependent Claim
124 words
A KEYBOARD OPERATED TONE GENERATOR COMPRISING A UNIJUNCTION TRANSISTOR, A CAPACITOR CONNECTED ACROSS THE JUNCTION OF SAID TRANSISTOR, A CONTROLLED VARIBLE CHARGING CIRCUIT FOR SAID CAPACITOR SAID CHARGING CIRCUIT INCLUDING A CONSTANT CURRENT TRANSISTOR CONNECTED TO CHARGE SAID CAPACITOR AND A TRANSISTOR FEEDBACK CIRCUIT CONNECTED TO CONTROL SAID CONSTANT CURRENT TRNSISTOR TO SUPPLY A PREDETERMINED RANGE OF CURRENT VALUES, A KEYBOARD, AN ADJUSTABLE RESISTOR AND A PLURALITY OF FIXED RESISTORS PROPORTIONED ACCORDING TO THE NOTES OF SAID KEYB OARD CONNECTED IN SERIES ACROSS A REGULATED VOLTAGE SOURCE, A MEMORY CAPACITOR, SWITCH MEANS OPERATED BY THE KEYS OF SAID KEYBOARD TO CHARGE SAID MEMORY CAPACITOR TO THE VOLTAGE BETWEEN ADJACENT ONES OF SAID RESISTORS CORRESPONDING TO THE ACTUATED KEY OF SAID KEYBOARD, A CONNECTION FROM
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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) | 1969-10-31 | 1970-05-02 | 1970-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-31 | 1974-05-02 | 1974-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-31 | 1978-05-02 | 1978-11-01 | $7700.00 | Window Closed / Lapsed |