What this record means
The record shows that “JACK” was registered on the Principal Register to Gustav Magenwirth GmbH & Co. KG but was cancelled on September 21 2012 because the registrant failed to file a required Section 8 declaration, so the mark is no longer live. It covered only one class—Class 012—specifically “hydraulic operating mechanisms for clutches of motorized two‑wheeled vehicles or motorcycles,” so a similar name used for anything outside that narrow mechanical field would be the closest area of concern, while unrelated goods or services fall farther from the scope shown. The record does not give the owner control over every use of the word “JACK.” The prosecution history shows the application was examined, amended, approved for publication, and ultimately registered, but the later cancellation reflects a maintenance failure rather than a supplemental‑register issue. The supplied history contains no oppositions, cancellations by third parties, or court actions, so no enforcement signals appear. I'd treat this as a limited, historical concern confined to the listed motorcycle‑clutch mechanisms.
Informational only - not legal advice.