The only case of actual intake/inlet thrust I have ever heard of is on the SR71 Blackbird. It has a movable cone in each of its two inlets.
"AT MACH 2.2 THE INLET PRODUCES 13% OF THE OVERALL
THRUST, THE ENGINE AND EJECTOR ACCOUNTING FOR 73%
AND 14% RESPECTIVELY"
Source: Page 15 of this PDF
http://www.enginehistory.org/Convent...ropulsion2.pdf