Who owns the PROM-BLOCK trademark?

The PROM-BLOCK trademark is owned by HOUSTON ENGINEERING RESEARCH CORPORATION.

What class is the PROM-BLOCK trademark registered in?

The PROM-BLOCK trademark is registered in Class 026 (Lace, embroidery, ribbons, buttons & haberdashery).

The USPTO serial number for PROM-BLOCK is 72437376.

PROM-BLOCK is registered under USPTO registration number 1007597.

Updated Nov 2, 2026·36 searches this week

PRO

ABANDONED

Lace and embroidery, and haberdashery ribbons and bows; buttons, hooks and eyes, pins and needles; artificial flowers; hair decorations; false hair.

Class 026Lace, embroidery, ribbons, buttons & haberdashery

US codes: 026

First use anywhere: Jul 06, 1971

First use in commerce: May 01, 1972

Lace and embroidery, and haberdashery ribbons and bows; buttons, hooks and eyes, pins and needles; artificial flowers; hair decorations; false hair.

This description is as filed with the USPTO and defines the scope of trademark protection.