Patent US3171070A successfully refreshed from Google Patents.
US3171070A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic controlled motor system for process control
Assignee: Leeds and Northrup Co
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Filing: 1960-02-05
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Granted: 1965-02-23
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Expires: 1980-02-05
Abstract
No abstract record available.
Inventors
- 👤 Harold A List
- 👤 Willem H Van Aller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:02
CPC Classifications
G; G05; G05D; G05D16/00; G05D16/20; G05D16/2006; G05D16/2013; G05D16/202
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
125 words
AN AUTOMATIC CONTROL SYSTEM COMPRISING MEANS RESPONSIVE TO THE DEVIATIONS OF A CONDITION FROM A DESIRED MAGNITUDE THEREOF FOR PRODUCING A FIRST ELECTRICAL SIGNAL IN SENSE AND MAGNITUDE CORRESPONDING WITH THE EXISTING DEVIATION, A CONTROL ELEMENT ADJUSTABLE THROUGH A RANGE OF POSITIONS FOR CHANGING A PROCESS VARIABLE AFFECTING THE MAGNITUDE OF SAID CONDITION, A REVERSIBLE MOTOR FOR ADJUSTING SAID CONTROL ELEMENT, A TACHOMETER GENERATOR DRIVEN BY SAID MOTOR FOR PRODUCING A SECOND ELECTRICAL SIGNAL IN SENSE AND MAGNITUDE CORRESPONDING WITH THE DIRECTION AND RATE OF CHANGE OF POSITION OF SAID CONTROL ELEMENT, MEANS FOR COMBINING SAID ELECTRICAL SIGNALS TO PRODUCE A RESULTANT ELECTRICAL SIGNAL OF SIGN DEPENDENT UPON THE MAGNITUDE AND SIGN OF SAID FIRST AND SECOND SIGNALS, A PAIR OF DIRECTION-RELAYS SELECTIVELY ENERGIZED IN
Claim 2
Dependent Claim
125 words
AN AUTOMATIC CONTROL SYSTEM COMPRISING MEANS RESPONSIVE TO THE DEVIATIONS OF A CONDITION FROM A DESIRED MAGNITUDE THEREOF FOR PRODUCING A FIRST ELECTRICAL SIGNAL IN SENSE AND MAGNITUDE CORRESPONDING WITH THE EXISTING DEVIATION, A CONTROL ELEMENT ADJUSTABLE THROUGH A RANGE OF POSITIONS FOR CHANGING A PROCESS VARIABLE AFFECTING THE MAGNITUDE OF SAID CONDITION, A REVERSIBLE MOTOR FOR ADJUSTING SAID CONTROL ELEMENT, A TACHOMETER GENERATOR DRIVEN BY SAID MOTOR FOR PRODUCING A SECOND ELECTRICAL SIGNAL IN SENSE AND MAGNITUDE CORRESPONDING WITH THE DIRECTION AND RATE OF CHANGE OF POSITION OF SAID CONTROL ELEMENT, MEANS FOR COMBINING SAID ELECTRICAL SIGNALS TO PRODUCE A RESULTANT ELECTRICAL SIGNAL OF SIGN DEPENDENT UPON THE MAGNITUDE AND SIGN OF SAID FIRST AND SECOND SIGNALS, A PAIR OF DIRECTION-RELAYS SELECTIVELY ENERGIZED IN
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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) | 1968-02-23 | 1968-08-24 | 1969-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-02-23 | 1972-08-24 | 1973-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-02-23 | 1976-08-24 | 1977-02-23 | $7700.00 | Window Closed / Lapsed |