I think LH had a subsidiary which operated a business class only service from FRA or CGN to EWR, with about 70 seats on a 737.
Edit : I found this, but the information is no longer current
Lufthansa Business Jet - FlyerWiki
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Lufthansa Business Jet
Lufthansa Business Jet
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You enjoy the highest comfort and ideal connections on your flight between Europe and the USA. On board there is only one class of service - Business Class with only 44 seats on the Boeing 737 on flights to/from Munich and 48 seats on the Airbus A319 to/from Dusseldorf.[1] Lufthansa will operate this additional, all-Business Class flight with a Boeing 737 that has been refitted as a Business Jet. The aircraft has 44 modern lie-flat seats. When fully reclined, these provide an almost horizontal sleeping surface measuring two metres (6’6”) in length. Flights depart Frankfurt daily except Saturdays at 8.15 hrs and arrive in Newark at 11.45 hrs. Each day the new connection will be the first Lufthansa flight to land in New York. The return flight is scheduled for 15.55 hrs, touching down in Frankfurt the following day at 5.40 hrs. These flights can, of course, be combined with any of the existing services between New York and Frankfurt or Munich.