§
Luxuse
Patent Intelligence
Sign In
← Back to Patent Explorer
EP0147002A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Device for judging the quality of precious stones

Assignee: Jdm YK
•
Filing: 1984-07-13
•
Granted: —
•
Expires: 2004-07-13
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract A device for judging the quality of precious stones such as diamonds with ease. The device especially enables judgement of quality of cut, clarity or existence of imperfec- tions and colour grade of diamonds without requiring expert skill or experience. The device has a body (1) 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 mounted on the body (1) between the window (3) and the light source (2). A base plate (14) is slidably mounted on the body (1) and a magnifying glass (12) for viewing precious stones 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 coloured in red or silver or other colour.

Inventors

  • 👤 Tsuyoshi Shigetomi
  • 👤 Kazuo Inoue

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-03 04:35
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/84; G01N21/87; G01N21/88; G01N21/8803

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 115 words
A device for judging the quality of precious stones characterized in that the device comprises a body (1), a plate (4) for supporting precious stones (5) slidably mounted on the body (1) between a window (3) provided on the upper part of the body (1) and a light source (2) provided on the lower part thereof, a magnifying glass (12) for viewing precious stones (5) through said window (3) and which is fixed to a base plate (14) slidably mounted on the device body (1), and a disc (17) having a small hole (18) at its centre mounted on the object.lens side of the magnifying glass (12), the exterior of the disc (12) being coloured.
Claim 2
Independent Claim 115 words
A device for judging the quality of precious stones characterized in that the device comprises a body (1), a plate (4) for supporting precious stones (5) slidably mounted on the body (1) between a window (3) provided on the upper part of the body (1) and a light source (2) provided on the lower part thereof, a magnifying glass (12) for viewing precious stones (5) through said window (3) and which is fixed to a base plate (14) slidably mounted on the device body (1), and a disc (17) having a small hole (18) at its centre mounted on the object.lens side of the magnifying glass (12), the exterior of the disc (12) being coloured.
Claim 3
Dependent Claim 19 words
A device as claimed in claim 1, characterized in that the exterior of the disc (12) is coloured red.
Claim 4
Dependent Claim 19 words
A device as claimed in claim 1, characterized in that the exterior of the disc (12) is coloured silver.
Claim 5
Independent Claim 26 words
A device as claimed in any one of the preceding claims, characterized in that the support plate (4) is provided with a plurality of openings (7;9;22).
Claim 6
Independent Claim 53 words
A device as claimed in any one of the preceding claims, characterized in that the supporting plate (4) comprises a main body (4c) formed from transparent plate and a white upper plate (4d) fixed to the centre of the main body (4c), the upper plate (4d) being provided with a horizontal groove (21).

References Cited (Backward Citations)

No citation records indexed.

USPTO Annuity & Maintenance Windows

Maintenance schedule is calculated for granted US utility patents.

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag