Fine working of gems, jewels, crystals, e.g. of semiconductor material; Apparatus therefor

Introduced: September 1968

Last revised: January 2006

Classification Context

Section:: PERFORMING OPERATIONS; TRANSPORTING
Class:: WORKING CEMENT, CLAY, OR STONE
Subclass:: WORKING STONE OR STONE-LIKE MATERIALS

Related Keywords

BORING gems, jewels, crystals or semiconductor materialBORING glasscutting or working CRYSTALSDRILLING gems, jewels, crystals or semiconductor materialDRILLING glassdrilling or boring GLASScutting or working SEMICONDUCTOR(S) material

2 direct subcodes

Child Classifications

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B28D 5/02 by rotary tools, e.g. drills
B28D 5/04 by tools other than of rotary type, e.g. reciprocating tools

Top Applicants

Top 10 applicants by patent filingsfor class B28, 2013–2023, worldwide · Source: EPO PATSTAT

MITSUBOSHI DIAMOND INDUSTRIAL COMPANY 868
QINGDAO GAOCE TECHNOLOGY COMPANY 678
DISCO CORPORATION JP 500
ZHOU ZHAODI 500
MITSUBOSHI DIAMOND INDUSTRIAL COMPANY JP 456
HILTI LI 455
CORNING US 407
UNITED STATES GYPSUM COMPANY US 375
ZHENGZHOU YUAN DONG REFRACTORIES COMPANY 370
HUNAN SANY KUAIERJU RESIDENTIAL INDUSTRY COMPANY 351