US3223180A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic work pressure control system
Assignee: McGraw Edison Co
•
Filing: 1961-08-07
•
Granted: 1965-12-14
•
Expires: 1981-08-07
Abstract
No abstract record available.
Inventors
- 👤 Welling T Akin
- 👤 Ivan Van Schoick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:57
CPC Classifications
B; B23; B23Q; B23Q15/00; B23Q15/007; B23Q15/12; B24; B24B; B24B49/00; B24B49/16
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
140 words
A SYSTEM FOR CONTROLLING THE WORKING PRESSURE BETWEEN A WORKPIECE AND A TOOL, ONE OF WHICH IS DRIVEN BY AN ELECTRIC MOTOR WHOSE CURRENT VARIES AS THE WORKING PRESSURE AND ONE OF WHICH IS SHIFTABLE BY REVERSIBLE FEED MEANS TOWARD OR AWAY FROM THE OTHER TO MAINTAIN A PRESELECTED WORKING PRESSURE, COMPRISING: FIRST MEANS FOR SENSING VARIATIONS IN THE MOTOR CURRENT AND GENERATING A D.C. OUTPUT VOLTAGE FLUCTUATING DIRECTLY PROPORTIONAL TO THE CURRENT FLUCTUATIONS THROUGHOUT THE RUNNING CURRENT RANGE OF THE MOTOR, SECOND MEANS FOR PROVIDING A PRESELECTED D.C. REFERENCE VOLTAGE, AND MEANS COUPLED WITH THE FIRST AND SECOND MEANS AND ADAPTED TO BE COUPLED WITH THE FEEDING MEANS AND INCLUDING CIRCUITS RESPONSIVE TO THE GENERATED D.C. VOLTAGE FROM SUCH FIRST MEANS EXCEEDING THE D.C. REFERENCE VOLTAGE OF THE SECOND MEANS TO CAUSE SAID FEEDING MEANS TO REVERSE THE DIRECTION
References Cited (Backward Citations)
US1871750A
Cited
US2331123A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-12-13 | 1969-06-14 | 1969-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-13 | 1973-06-14 | 1973-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-13 | 1977-06-14 | 1977-12-14 | $7700.00 | Window Closed / Lapsed |