Patent US3059704A successfully refreshed from Google Patents.
Patent US2717692A successfully refreshed from Google Patents.
US2717692A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mineral concentrators
Assignee: Individual
•
Filing: 1952-06-30
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Granted: 1955-09-13
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Expires: 1972-06-30
Abstract
No abstract record available.
Inventors
- 👤 Brown Harold
- 👤 William A Lamb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:41
CPC Classifications
B; B07; B07B; B07B1/00; B07B1/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
142 words
MEANS FOR RECOVERING METALLIC VALUES FROM ORE COMPRISING: A ROTARY SCREENING BARREL OF SMALLER DIAMETER AT ITS FEED EXTREMITY THAN AT THE OTHE R EXTREMITY; A PLURALITY OF STRAIGHT, SPACED-APART RODS FORMING THE WALL OF SAID BARREL, SAID RODS BEING SPACED CLOSER TOGETHER AT SAID FEED EXTREMITY THAN AT SAID OTHER EXTREMITY; MEANS FEEDING ORE INTO THE FEED EXTREMITY OF SAID BARREL; AN INCLINED PLATE BELOW SAID BARREL RECEIVING THE ORE PARTICLES FALLING BETWEEN SAID RODS AND CAUSING SAID PARTICLES TO FALL OVER ITS LOWER EDGE IN A VERTICAL CURTAIN-LIKE LAYER OF PARTICLES UNIFORMLY VARYING IN SIZE IN ACCORDANCE WITH THE SPACING OF SAID RODS; AN AIR ORIFICE POSITIONED TO ONE SIDE OF THE VERTICAL PLANE OF SAID LOWER EDGE AND EXTENDING SPACED FROM AND HORIZONTALLY ACROSS THE ENTIRE WIDTH OF SAID CURTAINLIKE LAYER; AND MEANS FOR SUPPLYING AIR TO SAID ORIFICE.
Claim 2
Dependent Claim
142 words
MEANS FOR RECOVERING METALLIC VALUES FROM ORE COMPRISING: A ROTARY SCREENING BARREL OF SMALLER DIAMETER AT ITS FEED EXTREMITY THAN AT THE OTHE R EXTREMITY; A PLURALITY OF STRAIGHT, SPACED-APART RODS FORMING THE WALL OF SAID BARREL, SAID RODS BEING SPACED CLOSER TOGETHER AT SAID FEED EXTREMITY THAN AT SAID OTHER EXTREMITY; MEANS FEEDING ORE INTO THE FEED EXTREMITY OF SAID BARREL; AN INCLINED PLATE BELOW SAID BARREL RECEIVING THE ORE PARTICLES FALLING BETWEEN SAID RODS AND CAUSING SAID PARTICLES TO FALL OVER ITS LOWER EDGE IN A VERTICAL CURTAIN-LIKE LAYER OF PARTICLES UNIFORMLY VARYING IN SIZE IN ACCORDANCE WITH THE SPACING OF SAID RODS; AN AIR ORIFICE POSITIONED TO ONE SIDE OF THE VERTICAL PLANE OF SAID LOWER EDGE AND EXTENDING SPACED FROM AND HORIZONTALLY ACROSS THE ENTIRE WIDTH OF SAID CURTAINLIKE LAYER; AND MEANS FOR SUPPLYING AIR TO SAID ORIFICE.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-09-12 | 1959-03-14 | 1959-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-09-12 | 1963-03-14 | 1963-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-09-12 | 1967-03-14 | 1967-09-13 | $7700.00 | Window Closed / Lapsed |