US4124698A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of chemically sharpening monocrystalline ribbon
Assignee: Saint Gobain Ceramics and Plastics Inc
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Filing: 1977-02-14
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Granted: 1978-11-07
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Expires: 1997-02-14
Abstract
Abstract The invention is a method for sharpening opposed edges of a monocrystalline ribbon. The method consists of suspending a monocrystalline body of a material such as alpha-alumina in the form of a ribbon (or plate) in a body of a selected solvent, and providing relative movement between the ribbon and solvent with the direction of relative movement being generally normal to the plane of the ribbon.
Inventors
- 👤 Naim Hemmat
- 👤 Harold E. LaBelle, Jr.
- 👤 Charles Lamport
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:32
CPC Classifications
C; C30; C30B; C30B33/00; C30B29/00; C30B29/10; C30B29/16; C30B29/20
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
90 words
A method of sharpening opposed edges on an elongate substantially monocrystalline alumina ribbonlike body comprising suspending said body in a solvent for said alumina, and establishing and maintaining relative movement between said body and said solvent with the direction of relative movement being generally normal to the plane of said body, said movement being controlled so as to substantially avoid turbulence within said solvent, and periodically reversing the direction of said relative movement while maintaining said body suspended in said solvent so as to substantially equally sharpen said opposed edges.
Claim 2
Independent Claim
90 words
A method of sharpening opposed edges on an elongate substantially monocrystalline alumina ribbonlike body comprising suspending said body in a solvent for said alumina, and establishing and maintaining relative movement between said body and said solvent with the direction of relative movement being generally normal to the plane of said body, said movement being controlled so as to substantially avoid turbulence within said solvent, and periodically reversing the direction of said relative movement while maintaining said body suspended in said solvent so as to substantially equally sharpen said opposed edges.
Claim 3
Dependent Claim
15 words
A method of claim 1 wherein said body is disposed substantially vertically within said solvent.
Claim 4
Dependent Claim
23 words
A method of claim 1 wherein said body comprises monocrystalline alpha-alumina, and said solvent is selected from vanadium pentoxide and potassium tantalate niobate.
Claim 5
Dependent Claim
18 words
A method of claim 1 wherein said relative movement is achieved by moving said body through said solvent.
Claim 6
Dependent Claim
18 words
A method of claim 1 wherein said relative movement is achieved by flowing said solvent past said body.
Claim 7
Dependent Claim
19 words
A method of claim 1 wherein said ribbon is formed so that its c-axis is parallel its longitudinal axis.
Claim 8
Dependent Claim
26 words
A method of claim 1 wherein said elongate body comprises an elongate, substantially monocrystalline alumina ribbon, whose C-axis is disposed parallel to its longitudinal geometric axis.
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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) | 1981-11-06 | 1982-05-08 | 1982-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-11-06 | 1986-05-08 | 1986-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-11-06 | 1990-05-08 | 1990-11-07 | $7700.00 | Window Closed / Lapsed |