CPC Subgroup
B28B 21/60 prestressed reinforcements
Full Title
Methods or machines specially adapted for the production of tubular articles > incorporating reinforcements > prestressed reinforcements
2 direct subcodes
Child Classifications
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- B28B 21/62 circumferential
- B28B 21/66 Reinforcing mats
Top Applicants
Top 10 applicants by patent filingsfor class B28, 2013–2023, worldwide · Source: EPO PATSTAT
- DISCO CORPORATION JP 1,471
- HILTI LI 575
- CORNING US 544
- MITSUBOSHI DIAMOND INDUSTRIAL COMPANY JP 518
- UNITED STATES GYPSUM COMPANY US 485
- DISCO ABRASIVE SYSTEM 459
- GE (GENERAL ELECTRIC COMPANY) US 454
- MITSUBOSHI DIAMOND INDUSTRIAL COMPANY 439
- DISCO CORPORATION 403
- NGK INSULATORS JP 308