About 2 years ago, the Washington Post's foraging column did an article about Aji Ichiban, which was identified as being in the same Gateway Tower complex on N. Washington St. as Bob's Noodle. I've seen addresses at both 309 N. Washington St. and 401 N. Washington St.
The Web site isn't very helpful; it has little pins and flags indicating that there are stores in the region, but there are no addresses and the pins could be located anywhere from Richmond to Philadelphia.
Aji Ichiban is supposedly a franchise of a Hong-Kong chain, specializing in snack foods.
Would one of you Bob's Noodles regulars chime in to say whether it is still there? My home (Herndon) isn't exactly close to Rockville, but I'll plan a detour next time I'm in the region if it is still around.