Patent US3248634A successfully refreshed from Google Patents.
US3248634A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic ringing generator
Assignee: TDK Micronas GmbH
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Filing: 1962-08-28
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Granted: 1966-04-26
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Expires: 1982-08-28
Abstract
No abstract record available.
Inventors
- 👤 Fudaley Solly Lawrence
- 👤 Jr Louis Mourlan
- 👤 John E Busch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:34
CPC Classifications
H; H04; H04M; H04M19/00; H04M19/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
139 words
AN ELECTRONIC RINGING GENERATOR FOR SUPPLYING RINGING CURRENT OF A PREDETERMINED FREQUENCY COMPRISING D.C. TO D.C. CONVERTER MEANS FOR STEPPING UP BATTERY SUPPLY VOLTAGE TO D.C. POTENTIALS SUFFICIENT TO ENERGIZE TELEPHONE RINGERS, SAID CONVERTOR COMPRISING TRANSISTORIZED SATURABLE REACTOR SQUARE WAVE OSCILLATOR MEANS, SAID OSCILLATOR COMPRISING A RESISTIVE NEGATIVE FEEDBACK CIRCUIT, MEANS FOR AUTOMATICALLY COLLAPSING THE OPERATION OF SAID OSCILLATOR WHEN SAID CONVERTER LOAD REACHES A PREDETERMINED MAXIMUM AND FOR AUTOMATICALLY RESTABLISHING THE OPERATION OF SAID OSCILLATOR WHEN SAID CONVERTER LOAD FALLS BELOW SAID PREDETERMINED MAXIMUM, RECTIFYING MEANS COUPLED TO THE OUTPUT OF SAID OSCILLATOR FOR RECTIFYING SAID SQUARE WAVE TO OBTAIN D.C. SIGNALS OF SAID RINGING POTENTIAL, RINGING GENERATOR OUTPUT TERMINALS, POWER SWITCHING MEANS, MEANS CONNECTED TO SAID CONVERTER RECTIFYING MEANS FOR COUPLING SAID SIGNALS OF RINGING POTENTIAL TO SAID OUTPUT TERMINALS, SAID SWITCH MEANS INCLUDING MEANS FOR AUTO-
Claim 2
Dependent Claim
139 words
AN ELECTRONIC RINGING GENERATOR FOR SUPPLYING RINGING CURRENT OF A PREDETERMINED FREQUENCY COMPRISING D.C. TO D.C. CONVERTER MEANS FOR STEPPING UP BATTERY SUPPLY VOLTAGE TO D.C. POTENTIALS SUFFICIENT TO ENERGIZE TELEPHONE RINGERS, SAID CONVERTOR COMPRISING TRANSISTORIZED SATURABLE REACTOR SQUARE WAVE OSCILLATOR MEANS, SAID OSCILLATOR COMPRISING A RESISTIVE NEGATIVE FEEDBACK CIRCUIT, MEANS FOR AUTOMATICALLY COLLAPSING THE OPERATION OF SAID OSCILLATOR WHEN SAID CONVERTER LOAD REACHES A PREDETERMINED MAXIMUM AND FOR AUTOMATICALLY RESTABLISHING THE OPERATION OF SAID OSCILLATOR WHEN SAID CONVERTER LOAD FALLS BELOW SAID PREDETERMINED MAXIMUM, RECTIFYING MEANS COUPLED TO THE OUTPUT OF SAID OSCILLATOR FOR RECTIFYING SAID SQUARE WAVE TO OBTAIN D.C. SIGNALS OF SAID RINGING POTENTIAL, RINGING GENERATOR OUTPUT TERMINALS, POWER SWITCHING MEANS, MEANS CONNECTED TO SAID CONVERTER RECTIFYING MEANS FOR COUPLING SAID SIGNALS OF RINGING POTENTIAL TO SAID OUTPUT TERMINALS, SAID SWITCH MEANS INCLUDING MEANS FOR AUTO-
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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) | 1969-04-25 | 1969-10-25 | 1970-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-25 | 1973-10-25 | 1974-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-25 | 1977-10-25 | 1978-04-26 | $7700.00 | Window Closed / Lapsed |