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Blonder–Tongue doctrine.Patents. The rule that a patentee is barred by collateral estoppel from relitigating the validity of a patent that has been held invalid in an earlier proceeding in which the patentee had a full and fair opportunity to litigate the patent’s validity. • The rule was adopted by the U.S. Supreme Court in Blonder–Tongue Laboratories,…

block voting.A shareholders’ agreement to cast their votes in a single block. See voting trust under TRUST.[Blacks Law 8th]

block policy.See INSURANCE POLICY. [Blacks Law 8th]

block interest.See add-on interest under INTEREST(3).[Blacks Law 8th]

blocking patent.See PATENT(3).[Blacks Law 8th]

block grant.An unrestricted grant of federal funds. [Cases: United States  82. C.J.S. United States § 155.][Blacks Law 8th]

blocked income.See INCOME. [Blacks Law 8th]

blocked currency.See CURRENCY. [Blacks Law 8th]

blocked account.See ACCOUNT.[Blacks Law 8th]

blockbusting. The act or practice, usu. by a real-estate broker, of persuading one or more property owners to sell their property quickly, and often at a loss, to avoid an imminent influx of minority groups. • Blockbusting is illegal in many states. [Cases: Brokers  1, 4; Civil Rights  1076. C.J.S. Brokers §§ 6–12; Civil Rights…