What this record means
The record shows that (ONEPLUSONE)3 is a cancelled Principal Register service mark owned by (oneplusone)3 Inc., a Missouri corporation, and it is no longer live; the cancellation occurred on April 19 2013 because the registrant failed to file a required Section 8 declaration. The registration covered only class 035 services—specifically business management consulting services for accountants, tax and financial professionals—so a similar name used in that consulting niche would be the closest area of concern, while uses in unrelated fields fall farther from the scope shown. The record does not give the owner control over every possible use of the words “oneplusone” or “3.” Because the mark was never placed on the Supplemental Register, there is no supplemental‑register examination sequence to note. The latest meaningful event is the Section 8 cancellation in 2013, and the supplied history contains no oppositions, cancellations by others, or court actions, so no enforcement signals appear. I'd treat this as a moderate concern if you plan a consulting service aimed at accountants or tax professionals, but the risk drops sharply for other types of goods or services.
Informational only - not legal advice.