TY  - GEN
T1  - On the validity of double patents /
AU  - Johnston, Frank E.,
VL  - 1972 Vol 54 No 5 pages 291-309
ID  - 9590
KW  - Patents
KW  - Trademarks
KW  - PATENTS : ADDITIONAL, IMPROVEMENT PATENTS (DOUBLE PATENTING), PARALLEL PATENTS : UNITED STATES
KW  - RESTRICTIVE TRADE PRACTICES AND OTHER MATTERS : FRANCHISING : EUROPEAN COMMUNITY
TI  - On the validity of double patents /
ER  -