Patent US4641091A successfully refreshed from Google Patents.
US4641091A
Expired / Lapsed
US
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Device for testing and calibrating treasure hunting metal detectors
Assignee: Individual
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Filing: 1984-09-17
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Granted: 1987-02-03
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Expires: 2004-09-17
Abstract
Abstract A device for testing and calibrating treasure hunting metal detectors is provided. The device includes an enclosure which contains a quantity of background material of the type expected to be encountered in the search environment of the metal detector. Elongated cross members are positioned across the housing at varying distances from the top. Each cross member has an open interior region into which a slide containing a simulated metal treasure may be placed. When the search coil of a metal detector is placed on top of the device it senses the presence of the metal treasures in the slides within particular ones of the cross members. By varying the type of metal and the location of the simulated metal targets the capabilities of the treasure hunting metal detector can be tested and calibrated.
Inventors
- 👤 Ivan H. Cone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:38
CPC Classifications
G; G01; G01V; G01V13/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
125 words
A device for testing and calibrating a treasure hunting metal detector, comprising: an enclosure; a quantity of material of composition of the background material to be encountered in the search environment of said treasure hunting metal detector, said material being contained within said enclosure; a plurality of cross members, each of said plurality of cross members extending from a side of said enclosure into said enclosure, each of said plurality of cross members forming an open slot within the interior region of said enclosure and being surrounded by said quantity of material; and a plurality of slide members adapted to slide within said slots formed within said plurality of cross members, each of said slide members having a means of carrying a simulated metal treasure.
Claim 2
Independent Claim
125 words
A device for testing and calibrating a treasure hunting metal detector, comprising: an enclosure; a quantity of material of composition of the background material to be encountered in the search environment of said treasure hunting metal detector, said material being contained within said enclosure; a plurality of cross members, each of said plurality of cross members extending from a side of said enclosure into said enclosure, each of said plurality of cross members forming an open slot within the interior region of said enclosure and being surrounded by said quantity of material; and a plurality of slide members adapted to slide within said slots formed within said plurality of cross members, each of said slide members having a means of carrying a simulated metal treasure.
Claim 3
Dependent Claim
46 words
A device for testing and calibrating a treasure hunting metal detector in accordance with claim 1 in combination with cover means, said cover means serving to cover the top of the said enclosure and to support the search coil of said metal detector during a test.
Claim 4
Dependent Claim
38 words
A device for testing and calibrating a treasure hunting metal detector in accordance with claim 2 in combination with support means to support an extension probe, electronic controls and handle of said metal detector during test and calibration.
Claim 5
Dependent Claim
34 words
A device for testing and calibrating treasure hunting metal detectors in accordance with claim 3 wherein the intervals between said cross members correspond with depth settings on the readout meter of said metal detector.
Claim 6
Dependent Claim
31 words
A device for testing and calibrating a treasure hunting metal detector in accordance with claim 4 wherein each of said plurality of slides has an indentation shaped to hold a coin.
Claim 7
Dependent Claim
49 words
A device for testing and calibrating a treasure hunting metal detector in accordance with claim 5 wherein said material is water and wherein said plurality of elongated cross members are of integral fabrication to be waterproof whereby said slides are not brought in contact with said quantity of water.
References Cited (Backward Citations)
US2874349A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-02-02 | 1990-08-04 | 1991-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-02 | 1994-08-04 | 1995-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-02 | 1998-08-04 | 1999-02-03 | $7700.00 | Window Closed / Lapsed |