US4647194A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for judging brilliancy of precious stones such as diamonds or the like
Assignee: JDM Ltd Co
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Filing: 1984-06-28
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Granted: 1987-03-03
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Expires: 2004-06-28
Abstract
Abstract A device for judging precious stones such as diamonds with ease, especially enables judgment of quality of cut, clarity or existence of imperfections and color grade of diamonds without requiring expert skill or experience. The device body (1) is provided with a window (3) at its upper part and light source (2) at its lower part. A plate (4) for supporting precious stones such as diamonds, is slidably inserted and carried between the window (3) and the light source (2). A base plate (14) which is slidably secured, is also provided to the device body (1), and a magnifying glass (12) for presenting precious stones in enlargement through the window (3), is fixed to the base plate (14). On the object lens side of the magnifying glass (12) is mounted a disc (17) having a small hole (18). The exterior of the disc (17) is colored in red or silver.
Inventors
- 👤 Tsuyoshi Shigetomi
- 👤 Kazuo Inoue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:41
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/84; G01N21/87; G01N21/88; G01N21/8803
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
226 words
A device for judging brilliancy of precious stones such a diamonds comprising a box-like device body having a first side and an opposite second side, disposed in spaced relation, said device body having a side opening located between said first and second sides, a plate arranged to support precious stones is slidably insertable through said side opening and is supported within said device body between said first and second sides, said device body having a window in the first side thereof, a light source located within said device body with said plate being locatable between said window and light source, a base plate slidably secured to said device body and extending over said first side transversely of said window, a magnifying glass mounted on said base plate and arranged to provide viewing through said window for magnifying and inspecting precious stones mounted on said plate within said device body, said magnifying glass has an object lens side facing said plate, a disc having a small hole therethrough being mounted on the object lens side of said magnifying glass, said disc having a first side facing said plate and an oppositely directed second side, and said first side of said disc being colored for reflecting the color thereof onto the precious stone on said plate so that the reflected color can be viewed through said magnifying glass.
Claim 2
Independent Claim
226 words
A device for judging brilliancy of precious stones such a diamonds comprising a box-like device body having a first side and an opposite second side, disposed in spaced relation, said device body having a side opening located between said first and second sides, a plate arranged to support precious stones is slidably insertable through said side opening and is supported within said device body between said first and second sides, said device body having a window in the first side thereof, a light source located within said device body with said plate being locatable between said window and light source, a base plate slidably secured to said device body and extending over said first side transversely of said window, a magnifying glass mounted on said base plate and arranged to provide viewing through said window for magnifying and inspecting precious stones mounted on said plate within said device body, said magnifying glass has an object lens side facing said plate, a disc having a small hole therethrough being mounted on the object lens side of said magnifying glass, said disc having a first side facing said plate and an oppositely directed second side, and said first side of said disc being colored for reflecting the color thereof onto the precious stone on said plate so that the reflected color can be viewed through said magnifying glass.
Claim 3
Dependent Claim
18 words
A device, as set forth in claim 1, wherein said plate has a number of spaced openings therethrough.
Claim 4
Dependent Claim
56 words
A device, as set forth in claim 1, wherein said plate comprises a main body formed of a transparent plate and a white plate fixed to the center of said main body and facing toward the first side of said device body and said white plate having a groove for receiving precious stones to be inspected.
References Cited (Backward Citations)
CA699724A
Cited
US1744485A
Cited
US2494078A
Cited
US2742813A
Cited
DE1958962A1
Cited
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Cited
GB1403557A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-03-02 | 1990-09-01 | 1991-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-02 | 1994-09-01 | 1995-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-02 | 1998-09-01 | 1999-03-03 | $7700.00 | Window Closed / Lapsed |