Patent US3237068A successfully refreshed from Google Patents.
US3237068A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corona generating circuits
Assignee: RCA Corp
•
Filing: 1962-08-09
•
Granted: 1966-02-22
•
Expires: 1982-08-09
Abstract
No abstract record available.
Inventors
- 👤 Milton M Sowiak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:56
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/02; G03G15/0283; G03G15/0291; H; H03; H03K; H03K3/00; H03K3/78
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
125 words
IN AN ELECTROSTATIC CHARGING SYSTEM FOR ELECTROPHOTOGRAPHY IN WHICH DIFFERENT CORONA GENERATING ELEMENTS ARE ALTERNATELY ENERGIZED, A PULSE GENERATING CIRCUIT COMPRISING: (A) MEANS FOR GENERATING KEYING PULSES OF A FIRST FREQUENCY, (B) AN INDUCTIVE SHOCK-EXCITATION CIRCUIT FOR GENERATING HIGH VOLTAGE PULSES OF A SECOND FREQUENCY THAT IS HIGHER THAN SAID FIRST FREQUENCY FOR CORONA GENERATION, (C) MEANS FOR APPLYING SAID KEYING PULSES TO THE LASTMENTIONED CIRCUIT FOR GENERATING HIGH VOLTAGE PULSES TO SHOCK-EXCITE SAID HIGH VOLTAGE PULSES, (D) RECTIFIER AND CAPACITIVE MEANS CONNECTED IN SERIES WITH EACH AND TO SAID INDUCTIVE SHOCK-EXCITATION CIRCUIT FOR CLAMPING SAID HIGH VOLTAGE PULSES, AND (E) MEANS CONNECTED BETWEEN SAID RECTIFIER AND SAID CAPACITIVE MEANS FOR APPYLING SAID CLAMPED HIGH VOLTAGE PULSES TO SELECTED ONES OF SAID CORONA GENERATING ELEMENTS.
Claim 2
Dependent Claim
125 words
IN AN ELECTROSTATIC CHARGING SYSTEM FOR ELECTROPHOTOGRAPHY IN WHICH DIFFERENT CORONA GENERATING ELEMENTS ARE ALTERNATELY ENERGIZED, A PULSE GENERATING CIRCUIT COMPRISING: (A) MEANS FOR GENERATING KEYING PULSES OF A FIRST FREQUENCY, (B) AN INDUCTIVE SHOCK-EXCITATION CIRCUIT FOR GENERATING HIGH VOLTAGE PULSES OF A SECOND FREQUENCY THAT IS HIGHER THAN SAID FIRST FREQUENCY FOR CORONA GENERATION, (C) MEANS FOR APPLYING SAID KEYING PULSES TO THE LASTMENTIONED CIRCUIT FOR GENERATING HIGH VOLTAGE PULSES TO SHOCK-EXCITE SAID HIGH VOLTAGE PULSES, (D) RECTIFIER AND CAPACITIVE MEANS CONNECTED IN SERIES WITH EACH AND TO SAID INDUCTIVE SHOCK-EXCITATION CIRCUIT FOR CLAMPING SAID HIGH VOLTAGE PULSES, AND (E) MEANS CONNECTED BETWEEN SAID RECTIFIER AND SAID CAPACITIVE MEANS FOR APPYLING SAID CLAMPED HIGH VOLTAGE PULSES TO SELECTED ONES OF SAID CORONA GENERATING ELEMENTS.
References Cited (Backward Citations)
US2442770A
Cited
US2499234A
Cited
US2589240A
Cited
US2661421A
Cited
US2752533A
Cited
US2767359A
Cited
US2932742A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-02-21 | 1969-08-23 | 1970-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-21 | 1973-08-23 | 1974-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-21 | 1977-08-23 | 1978-02-22 | $7700.00 | Window Closed / Lapsed |