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Cha Industries

Cha Indust
Active Patents
0
Total Holdings
2

Patent Holdings

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Patent No. Title Status Filing Date Grant Date Claims Actions
US4214853A Evacuation apparatus with cryogenic pump and trap assembly Expired / Lapsed 1978-05-15 1980-07-29 36 Details
US3998347A Creep resistant sealing arrangement for bell jar Expired / Lapsed 1975-10-31 1976-12-21 8 Details