Patent US4401876A successfully refreshed from Google Patents.
US4401876A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Working gemstones
Assignee: Individual
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Filing: 1981-05-18
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Granted: 1983-08-30
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Expires: 2001-05-18
Abstract
Abstract In order to provide a better way of kerfing a gemstone such as a diamond, a high energy, high pulse rate, low order mode, laser beam is employed to cut the kerf. Apparatus for kerfing a gemstone can in general comprise a laser, reflecting means which bends the incident beam through a substantial angle and which is moveable substantially parallel to the axis of the incident beam, and a focusing arrangement which focuses the beam on the gemstone.
Inventors
- 👤 Martin Cooper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:56
CPC Classifications
B; B28; B28D; B28D5/00; B28D5/0005; B28D5/0011; B23; B23K; B23K26/00; B23K26/02; B23K26/03; B23K26/032; B23K26/36; B23K26/40; B28D1/00; B28D1/22; B28D1/221; B23K2103/00; B23K2103/30; B23K2103/50
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
69 words
A method of cleaving a gemstone, comprising: mounting said gemstone in position, said gemstone having a surface to be kerfed; generating a high energy, low order mode, laser beam; focussing said beam substantially on said surface, thereby removing gemstone material from said surface; moving said beam relative to said surface, thereby cutting a kerf; and inserting the tip of a tool in said kerf and thereby cleaving the gemstone.
Claim 2
Independent Claim
69 words
A method of cleaving a gemstone, comprising: mounting said gemstone in position, said gemstone having a surface to be kerfed; generating a high energy, low order mode, laser beam; focussing said beam substantially on said surface, thereby removing gemstone material from said surface; moving said beam relative to said surface, thereby cutting a kerf; and inserting the tip of a tool in said kerf and thereby cleaving the gemstone.
Claim 3
Dependent Claim
22 words
The method of claim 1, wherein said laser beam is a pulsed beam having a pulse rate of at least 20 Hz.
Claim 4
Dependent Claim
17 words
The method of claim 1, wherein said laser beam has a wave length of about 1 μm.
Claim 5
Dependent Claim
23 words
The method of claim 1, wherein said laser beam is generated by a Nd/YAG laser having a stable resonator with an intracavity telescope.
Claim 6
Dependent Claim
48 words
The method of claim 1 or 4, wherein said laser beam is generated by a laser having a stable resonator with an intracavity telescope, the beam being pulsed with a pulse rate of at least 20 Hz, having a wave length of about 1 μm and low divergence.
Claim 7
Dependent Claim
73 words
The method of claim 1, wherein a substantially parallel laser beam is generated, and there are provided reflecting means on which said parallel beam is incident and which bend said parallel beam through a substantial angle, and moving means for moving said reflecting means in a direction substantially parallel to the axis of the said incident parallel beam, thereby moving said beam relative to said surface, to cut said kerf in said surface.
Claim 8
Dependent Claim
59 words
The method of claim 6, wherein said reflecting means is reflective for the wavelength of said parallel beam but is less reflective for at least one visible wavelength, means being provided for viewing said surface of said gemstone by eye through the back of said reflecting means, thereby viewing the focal point of said laser beam on said surface.
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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) | 1986-08-29 | 1987-02-28 | 1987-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-29 | 1991-02-28 | 1991-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-29 | 1995-02-28 | 1995-08-30 | $7700.00 | Window Closed / Lapsed |