US3260911A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High speed centrifuge and speed control circuit therefor
Assignee: Beckman Coulter Inc
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Filing: 1963-01-30
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Granted: 1966-07-12
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Expires: 1983-01-30
Abstract
No abstract record available.
Inventors
- 👤 Svein B Rasmussen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:34
CPC Classifications
H; H02; H02P; H02P1/00; H02P1/16; H02P1/166; H02P25/00; H02P25/02; H02P25/10; H02P25/14; Y; Y10; Y10S; Y10S388/00; Y10S388/907; Y10S388/921; Y10S388/923; Y10S388/924
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
163 words
A SPEED CONTROL SYSTEM FOR MOTOR DRIVEN DEVICES INCLUDING MOTORS OF THE TYPES HAVING ROTOR AND FIELD WINDINGS COMPRISING A TACHOMETER MOUNTED TO PRODUCE AN ELECTRICAL POTENTIAL HAVING A MAGNITUDE DEPENDENT UPON SPEED, A SOURCE OF REFERENCE POTENTIAL, MEANS FOR RECEIVING THE TACHOMETER POTENTIAL AND THE REFERENCE POTENTIOL AND PROVIDING AN DIFFERENCE SIGNAL, AN AMPLIFIER CONNECTED TO RECEIVE SAID DIFFERENCE SIGNAL AND PROVIDING A FIRST OUTPUT SIGNAL WHEN THE DIFFERENCE SIGNAL IS ABOVE A PREDETERMINED LEVEL AND A SECOND OUTPUT SIGNAL WHEN THE DIFFERENCE SIGNAL IS BELOW SAID LEVEL, A SOURCE OF POWER FOR DRIVING SAID MOTOR, MEANS FOR CONTROLLING THE POWER APPLIED FROM THE SOURCE TO THE MOTOR IN RESPONSE TO SAID FIRST SIGNAL TO CONTROL THE SPEED OF THE MOTOR IN A DESIRED DIRECTION, SWITCHING MEANS INCLUDING A CIRCUIT COMPRISING A COIL CONNECTED IN PARALLEL WITH THE CAPACITOR AND IN SERIES WITH THE RECTIFIER RESPONSIVE TO THE SECOND SIGNAL FOR REVERSING THE DIRECTION OF CURRENT IN THE FIELD WINDING AND APPLYING
References Cited (Backward Citations)
US2899619A
Cited
US2964691A
Cited
US3026464A
Cited
US3090901A
Cited
US3095534A
Cited
US3037157A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-07-11 | 1970-01-10 | 1970-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-07-11 | 1974-01-10 | 1974-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-07-11 | 1978-01-10 | 1978-07-12 | $7700.00 | Window Closed / Lapsed |