US3425515A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Digital control for mine hoist system
Assignee: General Electric Co
•
Filing: 1964-06-15
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Granted: 1969-02-04
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Expires: 1984-06-15
Abstract
No abstract record available.
Inventors
- 👤 William J Mcdonald
- 👤 Edward B Bynum Jr
- 👤 William E Cronquist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:19
CPC Classifications
B; B66; B66B; B66B1/00; B66B1/02; B66B1/06; B66B1/14; B66B1/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
104 words
IN A MINE HOIST SYSTEM WHEREIN A HOIST MOTOR MOVES A CONVEYANCE FROM ONE LEVEL TO ANOTHER LEVEL IN A MINE SHAFT, A REGISTER FOR INDIATING THE DISTANCE OF A TRIP BETWEEN SELECTED LEVELS, DIGITAL MEANS RESPONSIVE TO THE REGISTER FOR ESTABLISHING A COUNT PROPORTIONAL TO THE DISTANCE OF THE TRIP, MEANS RESPONSIVE TO THE MOVEMENT OF THE CONVEYANCE FOR CHANING THE COUNT CONTAINED IN SAID DIGITAL MEANS, AND MORE CONTROLLING MEANS RESPONSIVE TO ONE OR MORE PREDETERMINED CHANGES O THE COUNT TO ALTER THE SPEED OF THE HOIST MOTOR IN ONE OR MORE INCREMENTS, THEREBY ALTERING THE RATE OF MOVEMENT OF THE CONVEYANCE.
Claim 2
Dependent Claim
104 words
IN A MINE HOIST SYSTEM WHEREIN A HOIST MOTOR MOVES A CONVEYANCE FROM ONE LEVEL TO ANOTHER LEVEL IN A MINE SHAFT, A REGISTER FOR INDIATING THE DISTANCE OF A TRIP BETWEEN SELECTED LEVELS, DIGITAL MEANS RESPONSIVE TO THE REGISTER FOR ESTABLISHING A COUNT PROPORTIONAL TO THE DISTANCE OF THE TRIP, MEANS RESPONSIVE TO THE MOVEMENT OF THE CONVEYANCE FOR CHANING THE COUNT CONTAINED IN SAID DIGITAL MEANS, AND MORE CONTROLLING MEANS RESPONSIVE TO ONE OR MORE PREDETERMINED CHANGES O THE COUNT TO ALTER THE SPEED OF THE HOIST MOTOR IN ONE OR MORE INCREMENTS, THEREBY ALTERING THE RATE OF MOVEMENT OF THE CONVEYANCE.
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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) | 1972-02-04 | 1972-08-05 | 1973-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-04 | 1976-08-05 | 1977-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-04 | 1980-08-05 | 1981-02-04 | $7700.00 | Window Closed / Lapsed |