US3437899A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power source device for driving step motor of gyro
Assignee: Tokyo Keiki Inc
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Filing: 1966-08-04
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Granted: 1969-04-08
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Expires: 1986-08-04
Abstract
No abstract record available.
Inventors
- 👤 Yoichi Hirokawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:30
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/505; H02M7/515; G; G01; G01C; G01C19/00; G01C19/02; G01C19/04; G01C19/06; G01C19/08; H02M5/00; H02M5/40; H02M5/42; H02M5/44; H02M5/443; H02M5/45
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
191 words
A POWER SOURCE DEVICE FOR DRIVING A STEP MOTOR OF A GYRO COMPRISING A DC POWER SOURCE, AN INVERTER CONNECTED THERETO AND CONVERTING THE POWER SOURCE VOLTAGE INTO AN AC VOLTAGE, THE INVERTER CONSISTING OF A PLURALITY OF CONTROL RECTIFIER ELEMENTS, A CONVERTING COIL CONNECTED BETWEEN THE ANODES OF THE CONTROL RECTIFIER ELEMENTS AND AN IMPEDANCE CONNECTED BETWEEN THE MIDDLE POINT OF THE CONVERTING COIL AND THE PLUS SIDE OF THE DC POWER SOURCE, A GYRO DRIVE MOTOR ACTUATED BY ONE PORTION OF THE OUTPUT CURRENT OF THE INVERTER, A STEP MOTOR FOR THE GRYO ACTUATED BY THE OTHER PORTION OF THE CURRENT FROM THE INVERTER, A CONTROL CIRCUIT CONNECTED TO THE INVERTER AND CONSISTING OF CONTROL RECTIFIER ELEMENTS FOR SEQUENTIALLY APPLYING THE DC CURRENT INCLUDING PULSES FROM THE INVERTER TO THE WINDINGS OF THE STEP MOTOR, MEANS FOR CONNECTING THE TERMINAL OF THE IMPEDANCE OPPOSITE FROM THE PLUS SIDE OF THE DC POWER SOURCE TO THE ONE TERMINAL OF THE WINDINGS OF THE STEP MOTOR FOR THE GYRO, AND MEANS FOR CONNECTING THE MINUS SIDE OF THE DC POWER SOURCE TO THE MINUS SIDE OF THE SECOND-MENTIONED CONTROL RECTIFIER ELEMENTS.
Claim 2
Dependent Claim
191 words
A POWER SOURCE DEVICE FOR DRIVING A STEP MOTOR OF A GYRO COMPRISING A DC POWER SOURCE, AN INVERTER CONNECTED THERETO AND CONVERTING THE POWER SOURCE VOLTAGE INTO AN AC VOLTAGE, THE INVERTER CONSISTING OF A PLURALITY OF CONTROL RECTIFIER ELEMENTS, A CONVERTING COIL CONNECTED BETWEEN THE ANODES OF THE CONTROL RECTIFIER ELEMENTS AND AN IMPEDANCE CONNECTED BETWEEN THE MIDDLE POINT OF THE CONVERTING COIL AND THE PLUS SIDE OF THE DC POWER SOURCE, A GYRO DRIVE MOTOR ACTUATED BY ONE PORTION OF THE OUTPUT CURRENT OF THE INVERTER, A STEP MOTOR FOR THE GRYO ACTUATED BY THE OTHER PORTION OF THE CURRENT FROM THE INVERTER, A CONTROL CIRCUIT CONNECTED TO THE INVERTER AND CONSISTING OF CONTROL RECTIFIER ELEMENTS FOR SEQUENTIALLY APPLYING THE DC CURRENT INCLUDING PULSES FROM THE INVERTER TO THE WINDINGS OF THE STEP MOTOR, MEANS FOR CONNECTING THE TERMINAL OF THE IMPEDANCE OPPOSITE FROM THE PLUS SIDE OF THE DC POWER SOURCE TO THE ONE TERMINAL OF THE WINDINGS OF THE STEP MOTOR FOR THE GYRO, AND MEANS FOR CONNECTING THE MINUS SIDE OF THE DC POWER SOURCE TO THE MINUS SIDE OF THE SECOND-MENTIONED CONTROL RECTIFIER ELEMENTS.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-07 | 1972-10-07 | 1973-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-07 | 1976-10-07 | 1977-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-07 | 1980-10-07 | 1981-04-08 | $7700.00 | Window Closed / Lapsed |