TY - GEN AU - Killworth, Richard A., ID - 9805 KW - Patents KW - Trademarks KW - UNITED STATES : PATENTS : PATENTABILITY KW - PATENTS : PATENTABILITY : UNITED STATES T1 - Unity of invention in patents :35 USC 121 / TI - Unity of invention in patents :35 USC 121 / VL - 1972 Vol 54 No 4 pages 226-247 ER -