US3886695A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for grinding a gem stone
Assignee: HOGE RAAD VOOR DIAMANT
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Filing: 1973-05-17
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Granted: 1975-06-03
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Expires: 1993-05-17
Abstract
Abstract A gem stone to be ground is placed against a rotating grinding wheel, and thereupon the gem stone is turned relative to the grinding wheel until an ideal orientation has been determined for the gem stone relative to the grinding wheel. The frictional heating of the gem stone is measured in the region of contact of the same with the grinding wheel, and the contact pressure at which the gem stone contacts the grinding wheel is controlled as a function of the measured temperature and in such a manner as to maintain the temperature constant. The respective facets of the gem stone are thereupon ground with the grinding wheel.
Inventors
- 👤 Maximo Elbe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:30
CPC Classifications
B; B24; B24B; B24B9/00; B24B9/02; B24B9/06; B24B9/16; B24B9/167
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
130 words
In a method of grinding a gem stone, particularly a diamond, the steps of placing a gem stone to be ground against a rotating grinding wheel; turning said gem stone relative to said grinding wheel for determination of an ideal orientation of said gem stone relative to said grinding wheel; measuring the frictional heating of said gem stone; controlling the contact pressure at which said gem stone contacts said grinding wheel, as a function of the temperature of said gem stone and in such a manner as to maintain said temperature constant; determining the amount of material removal which takes place during the preceding steps; terminating the turning of said gem stone when said ideal orientation is reached; and grinding respective facets of said gem stone with said grinding wheel.
Claim 2
Dependent Claim
130 words
In a method of grinding a gem stone, particularly a diamond, the steps of placing a gem stone to be ground against a rotating grinding wheel; turning said gem stone relative to said grinding wheel for determination of an ideal orientation of said gem stone relative to said grinding wheel; measuring the frictional heating of said gem stone; controlling the contact pressure at which said gem stone contacts said grinding wheel, as a function of the temperature of said gem stone and in such a manner as to maintain said temperature constant; determining the amount of material removal which takes place during the preceding steps; terminating the turning of said gem stone when said ideal orientation is reached; and grinding respective facets of said gem stone with said grinding wheel.
Claim 3
Dependent Claim
130 words
In a method of grinding a gem stone, particularly a diamond, the steps of placing a gem stone to be ground against a rotating grinding wheel; turning said gem stone relative to said grinding wheel for determination of an ideal orientation of said gem stone relative to said grinding wheel; measuring the frictional heating of said gem stone; controlling the contact pressure at which said gem stone contacts said grinding wheel, as a function of the temperature of said gem stone and in such a manner as to maintain said temperature constant; determining the amount of material removal which takes place during the preceding steps; terminating the turning of said gem stone when said ideal orientation is reached; and grinding respective facets of said gem stone with said grinding wheel.
Claim 4
Dependent Claim
130 words
In a method of grinding a gem stone, particularly a diamond, the steps of placing a gem stone to be ground against a rotating grinding wheel; turning said gem stone relative to said grinding wheel for determination of an ideal orientation of said gem stone relative to said grinding wheel; measuring the frictional heating of said gem stone; controlling the contact pressure at which said gem stone contacts said grinding wheel, as a function of the temperature of said gem stone and in such a manner as to maintain said temperature constant; determining the amount of material removal which takes place during the preceding steps; terminating the turning of said gem stone when said ideal orientation is reached; and grinding respective facets of said gem stone with said grinding wheel.
Claim 5
Dependent Claim
38 words
A method as defined in claim 1, and further comprising the steps of turning the gem stones-immediately prior to completion of a respective facet being ground-through up to 10* from said ideal orientation while reducing said contact pressure.
Claim 6
Dependent Claim
36 words
A method as defined in claim 1, further comprising the step of polishing said gem stone; and wherein all of said steps are carried out on the same grinding wheel and without re-positioning said gem stone.
References Cited (Backward Citations)
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US2137405A
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US2429961A
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US2427064A
Cited
US2542698A
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US2829472A
Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-02 | 1978-12-02 | 1979-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-02 | 1982-12-02 | 1983-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-02 | 1986-12-02 | 1987-06-03 | $7700.00 | Window Closed / Lapsed |