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US4826563A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chemical polishing process and apparatus
Assignee: Honeywell Inc
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Filing: 1988-04-14
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Granted: 1989-05-02
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Expires: 2008-04-14
Abstract
Abstract A polyurethane disc having a reservoir and spokes cut therein is used in conjunction with potassium triiodide and ethylene glycol to polish mercury cadmium tellurium and cadmium tellurium electro-optical crystals. This process has been found to eliminate the need for lapping damage removal etch. The polyurethane disc is used with a lapping machine and run at low speed.
Inventors
- 👤 Gerald M. Hassett
- 👤 Linda A. Palmaccio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:37
CPC Classifications
B; B24; B24B; B24B37/00; B24B37/11; B24B37/20; B24B37/26; B24B37/04; B24B37/042; H; H10; H10P; H10P50/00; H10P50/20; H10P52/00; H10P95/00; H10P95/70
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
112 words
A system for chemically polishing a electro-optical crystal for use in conjunction with a lapping machine having a lap side and a work piece side, said work piece side having a plate of unmounted electro-optical crystals attached thereto, said system comprising: (a) a polyurethane disc having a reservoir and spokes cut therein, said reservoir in communication with said spokes, said polyurethane disc attached to said lap side of said lapping machine; (b) a chemical polishing solution comprising potassium triiodide and distilled water, said solution residing in said spokes and said reservoir; and (c) a lubricant introduced between said electro-optical crystals and said polyurethane disc when said polyurethane disc polishes said electro-optical crystals.
Claim 2
Independent Claim
112 words
A system for chemically polishing a electro-optical crystal for use in conjunction with a lapping machine having a lap side and a work piece side, said work piece side having a plate of unmounted electro-optical crystals attached thereto, said system comprising: (a) a polyurethane disc having a reservoir and spokes cut therein, said reservoir in communication with said spokes, said polyurethane disc attached to said lap side of said lapping machine; (b) a chemical polishing solution comprising potassium triiodide and distilled water, said solution residing in said spokes and said reservoir; and (c) a lubricant introduced between said electro-optical crystals and said polyurethane disc when said polyurethane disc polishes said electro-optical crystals.
Claim 3
Dependent Claim
22 words
The system of claim 1 wherein said polyurethane disc has a diameter greater than the diameter of the plate of electro-optical crystals.
Claim 4
Dependent Claim
40 words
The system of claim 1 wherein the disc is about 30.5 cm in diameter and about 5 mm thick and has a reservoir about 7.6 cm in diameter and the reservoir and spokes have a depth of about 25 mm.
Claim 5
Dependent Claim
17 words
The system of claim 1 wherein the lapping machine is operated at about 5 RPM for polishing.
Claim 6
Independent Claim
96 words
A method for chemically polishing an electro-optical crystal comprising the steps of: (a) attaching an electro-optical crystal to a lapping machine on the work piece side of the lapping machine; (b) cutting reservoir and spokes in a polyurethane disc; (c) affixing the cut polyurethane disc to the lapping machine on the lap side of said lapping machine; (d) adding a chemical polishing solution comprising potassium triiodide and distilled water to the reservoir and spokes; (e) adding a lubricant on said cut polyurethane disc; and (f) polishing at low speed the electro-optical crystal with the polyurethane disc.
Claim 7
Independent Claim
96 words
A method for chemically polishing an electro-optical crystal comprising the steps of: (a) attaching an electro-optical crystal to a lapping machine on the work piece side of the lapping machine; (b) cutting reservoir and spokes in a polyurethane disc; (c) affixing the cut polyurethane disc to the lapping machine on the lap side of said lapping machine; (d) adding a chemical polishing solution comprising potassium triiodide and distilled water to the reservoir and spokes; (e) adding a lubricant on said cut polyurethane disc; and (f) polishing at low speed the electro-optical crystal with the polyurethane disc.
Claim 8
Dependent Claim
17 words
The method of claim 5 wherein the polishing is conducted at a speed of about 5 RPM.
Claim 9
Dependent Claim
21 words
The method of claim 5 wherein the chemical polishing solution comprises a mixture of 50% potassium triiodide and 50% distilled water.
Claim 10
Dependent Claim
11 words
The method of claim 5 wherein the lubricant is ethylene glycol.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-05-01 | 1992-10-31 | 1993-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-01 | 1996-10-31 | 1997-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-01 | 2000-10-31 | 2001-05-02 | $7700.00 | Window Closed / Lapsed |