Patent US3253744A successfully refreshed from Google Patents.
US3253744A
Expired / Lapsed
US
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Electrical control system for grinding mill
Assignee: Nordberg Manufacturing Co
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Filing: 1964-09-22
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Granted: 1966-05-31
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Expires: 1984-09-22
Abstract
No abstract record available.
Inventors
- 👤 Arthur R Macpherson
- 👤 Robert C Meaders
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:45
CPC Classifications
G; G05; G05D; G05D7/00; G05D7/06; G05D7/0605; B; B02; B02C; B02C17/00; B02C17/18; B02C17/1805; B02C25/00; G01; G01G; G01G13/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
110 words
A METHOD OF CONTROLLING THE FEED TO A DUAL-CHAMBERED MATERIAL REDUCTION MILL INCLUDING THE STEPS OF WEIGHING ONE CHAMBER, SAID WEIGHT BEING MADE UP BY A MAJOR COMPONENT FROM THE CHARGE IN THE CHAMBER BEING WEIGHED AND A MINOR COMPONENT FROM THE CHARGE IN THE OTHER CHAMBER, VARYING AN ELECTRICAL IMPEDANCE IN ACCORDANCE WITH SAID WEIGHT, REMOVING FROM THE IMPEDANCE THAT PORTION CAUSED BY THE CHARGE IN THE OTHER CHAMBER, PROVIDING A REFERENCE ELECTRICAL IMPEDANCE VARIABLE WITH THE DESIRED CHARGE IN THE CHAMBER BEING WEIGHED, COMPARING SAID REFERENCE IMPEDANCE AND THE ADJUSTED WEIGHT IMPEDANCE AND VARYING THE RATE OF FEED TO THE CHAMBER BEING WEIGHED UNTIL SAID IMPEDANCE ARE EQUAL.
Claim 2
Independent Claim
110 words
A METHOD OF CONTROLLING THE FEED TO A DUAL-CHAMBERED MATERIAL REDUCTION MILL INCLUDING THE STEPS OF WEIGHING ONE CHAMBER, SAID WEIGHT BEING MADE UP BY A MAJOR COMPONENT FROM THE CHARGE IN THE CHAMBER BEING WEIGHED AND A MINOR COMPONENT FROM THE CHARGE IN THE OTHER CHAMBER, VARYING AN ELECTRICAL IMPEDANCE IN ACCORDANCE WITH SAID WEIGHT, REMOVING FROM THE IMPEDANCE THAT PORTION CAUSED BY THE CHARGE IN THE OTHER CHAMBER, PROVIDING A REFERENCE ELECTRICAL IMPEDANCE VARIABLE WITH THE DESIRED CHARGE IN THE CHAMBER BEING WEIGHED, COMPARING SAID REFERENCE IMPEDANCE AND THE ADJUSTED WEIGHT IMPEDANCE AND VARYING THE RATE OF FEED TO THE CHAMBER BEING WEIGHED UNTIL SAID IMPEDANCE ARE EQUAL.
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) | 1969-05-30 | 1969-11-29 | 1970-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-30 | 1973-11-29 | 1974-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-30 | 1977-11-29 | 1978-05-31 | $7700.00 | Window Closed / Lapsed |