Patent US2740520A successfully refreshed from Google Patents.
US2740520A
Expired / Lapsed
US
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Gold-recovering apparatus
Assignee: Individual
•
Filing: 1953-11-20
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Granted: 1956-04-03
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Expires: 1973-11-20
Abstract
No abstract record available.
Inventors
- 👤 Harry M Sanford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:50
CPC Classifications
B; B03; B03B; B03B5/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
112 words
IN A GOLD-RECOVERING APPARATUS: A PAN ADAPTED TO BE POSITIONED ON THE BED OF A STREAM, OR THE LIKE; A SUBSTANTIALLY UPRIGHT TUBULAR STANDARD SECURED TO THE PAN CENTRALLY THEREOF; AN AGITATOR HAVING A HUB TELESCOPED RELATIVE TO THE STANDARD; THE AGITATOR INCLUDING BLADES ATTACHED TO THE HUB TO STIR MATERIAL IN THE PAN; AN OPERATING SHAFT JOURNALLED IN THE TUBULAR STANDARD; MEANS REMOVABLY SECURING THE AGITATOR HUB TO THE SHAFT SO THAT BOTH WILL TURN AS A UNIT; A HOPPER SUPPORTED ON THE SHAFT IN SPACED RELATION ABOVE THE PAN, THEREBY PROVIDING A PASSAGEWAY THROUGH WHICH WATER OF THE STREAM MAY FLOW; THE HOPPER INCLUDING A SCREEN BOTTOM THROUGH WHICH GOLD-
References Cited (Backward Citations)
US7209A
Cited
US116763A
Cited
US672413A
Cited
US663296A
Cited
US659237A
Cited
US1948797A
Cited
US2676706A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-04-03 | 1959-10-03 | 1960-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-03 | 1963-10-03 | 1964-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-03 | 1967-10-03 | 1968-04-03 | $7700.00 | Window Closed / Lapsed |