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US3765984A Expired / Lapsed US ⏱️ 0.0 years remaining

Apparatus for chemically polishing crystals

Assignee: 3M Co
•
Filing: 1970-12-14
•
Granted: 1973-10-16
•
Expires: 1990-12-14
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Abstract

Abstract A method and apparatus for chemically polishing crystals of the group II(b) - VI(a) system of the periodic table using a mixture consisting essentially of bromine and methanol with the bromine being present in the amount within the range of about 0.05 to about 10 percent by volume of the total solution of the mixture and forming a moving fluid film of the mixture to polish the crystal surface is shown. The apparatus includes a polishing dish and crystal support disk which supports the crystal to be polished and positions the crystal surface to be polished adjacent a plate which forms part of the polishing dish and a dispensing means which supplies a polishing solution between the plate and crystal surface for establishing a fluid film therebetween to chemically polish the crystal surface.

Inventors

  • 👤 W Strehlow

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-26 21:44
CPC Classifications
H; H10; H10P; H10P50/00; B; B24; B24B; B24B37/00; B24B37/04

Claims Analysis

Total Claims: 2
Claim 1
Independent Claim 31 words
The apparatus of claim 1 wherein said circular plastic plate is formed of polymethylmethacrylate and is laminated to a high inertia material and said support disk is formed of borosilicate glass.
Claim 2
Dependent Claim 50 words
The apparatus of claim 2 wherein said driving means includes a shaft coaxially rigidly mounted to said high inertia material; support means journalled to said shaft for rotatably supporting said shaft for minimizing shaft vibration; and means operatively connected to said shaft for rotating said shaft at a predetermined rate.

References Cited (Backward Citations)

US3436286A Cited
US3383255A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1976-10-15 1977-04-16 1977-10-16 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1980-10-15 1981-04-16 1981-10-16 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1984-10-15 1985-04-16 1985-10-16 $7700.00 Window Closed / Lapsed

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