US3721465A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for holding gems
Assignee: Individual
•
Filing: 1971-02-04
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Granted: 1973-03-20
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Expires: 1991-02-04
Abstract
Abstract A method and apparatus for holding cabochons in which a hollow conduit having an opening at one end for receiving the cabochon is connected to a pump having a vacuum side and a pressure side. The end of the hollow conduit for holding the cabochon is provided with a seal made of flexible material so that when vacuum is applied, the cabochon seals the end of the hollow conduit so that the vacuum force will securely hold the cabochon in place. In this manner, such work as polishing and grinding may be carried out on the cabochon. On release of the vacuum, the cabochon is easily removed.
Inventors
- 👤 F Kraissl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:57
CPC Classifications
B; B24; B24B; B24B9/00; B24B9/02; B24B9/06; B24B9/16; B24B9/161
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
129 words
A cabochon dop comprising a hollow handle section a template mounted on said handle section having a hollow tube and a rigid support mounted on one end of said tube, said support having an aperture in communication with said end of said tube and having a shape substantially the generally shape desired in the finished gem; resilient means for sealing the cabochon on said template, said sealing means having a shape substantially the general shape desired in the finished gem such that a substantially airtight seal is formed; a conduit, one end of said conduit being in communication with the other end of said tube and; valve meAns for selectively retaining a vacuum within said sealing means means for applying a vacuum to the other end of said conduit.
Claim 2
Dependent Claim
129 words
A cabochon dop comprising a hollow handle section a template mounted on said handle section having a hollow tube and a rigid support mounted on one end of said tube, said support having an aperture in communication with said end of said tube and having a shape substantially the generally shape desired in the finished gem; resilient means for sealing the cabochon on said template, said sealing means having a shape substantially the general shape desired in the finished gem such that a substantially airtight seal is formed; a conduit, one end of said conduit being in communication with the other end of said tube and; valve meAns for selectively retaining a vacuum within said sealing means means for applying a vacuum to the other end of said conduit.
Claim 3
Dependent Claim
43 words
The dop according to claim 1 wherein said valve means is adapted to selectively retain a vacuum within said sealing means after said vacuum applying means is turned off and to vent said conduit to the atmosphere to effect release of said cabochon.
Claim 4
Dependent Claim
18 words
The dop according to claim 2 wherein said template is removably mounted on one end of said conduit.
Claim 5
Dependent Claim
26 words
The dop according to claim 3 wherein said sealing means comprises a rubber sealing cup, said cup lining the internal and upper surface of said support.
Claim 6
Dependent Claim
79 words
The dop according to claim 2 wherein said retaining and venting means comprises a petcock interposed between said conduit and said vacuum applying means, said petcock being selectively movable from a first position in which said conduit is in communication with said vacuum applying means, to a second position in which said conduit is in communication with the atmosphere, and to a third position in which said conduit is closed to order to retain a vacuum within said conduit.
Claim 7
Dependent Claim
26 words
The cabochon dop according to claim 2 further comprising means for applying pressure to said conduit to effect release of said cabochon from said sealing means.
Claim 8
Dependent Claim
40 words
The dop according to claim 2 further comprising a pump adapted to supply a vacuum force to said conduit, said pump having a pressure side and a vacuum side and means for selectively applying vacuum and pressure to said conduit.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-19 | 1976-09-18 | 1977-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-19 | 1980-09-18 | 1981-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-19 | 1984-09-18 | 1985-03-20 | $7700.00 | Window Closed / Lapsed |