Keystone Partners LLC – Trademark Portfolio

Entity Type: 16

Keystone Partners LLC holds 11 U.S. trademarks filed with the United States Patent and Trademark Office (USPTO), with a strong focus on Class 35 (Advertising & Business) — 7 filings in this category. The portfolio also extends into Class 43 (Hotels & Restaurants) across 4 Nice Classification classes. Currently, 3 trademarks are registered. Notable registered marks include ESSEX PARTNERS, KEYSTONE PARTNERS, and E3 ENGAGEMENT SURVEY. The owner is based in Boston, MA.