Historical clue formulations

• Game whose tokens have included the starts of 16-, 20-, 26-, 49- and 55-Across — 2020-05-18
• Game patented December 31, 1935 — 2015-12-31
• Where Illinois and Vermont are — 2002-02-08
• With 58-Across, 35-Across — 1997-03-14
• Kind of board — 1996-11-08
• Matter for the Federal Trade Commission — 1994-03-30