O
- Office action (See also Action by examining attorney, Provisional refusal of 66(a) applications, and Response to Office action)

- "Office Date" label 303.02(b)

- Office personnel
- not to express opinion on validity of registered mark 1801

- not to give legal advice 108.02

- not to testify 1801.01


- Official Gazette (See also Trademark Official Gazette) 106; 1502; 1502.01

- "Olympic" and other designations protected under Amateur Sports Act of 1978 1205.01 - 1205.01(b)(vii)

- One mark, application limited to 202.01; 807.01

- Operating divisions 803.01

- Opinion, Office personnel not to express 1801

- Opposition 1503 - 1503.05

- Order of examination 702.01

- Order of work 702 - 702.02

- Ordering abandoned application files 109.02

- Original document, filing of 302.01; 503.08

- Ornamentation 1202.03 - 1202.03(g)

- Other statutes protecting names, initials, marks, etc. C

- Owner of mark is proper party to apply 803.01; 1201

- Ownership of application or registration 1201 - 1201.07

- Ownership of mark (See also Applicant, Assignment, Ownership of application or registration, and Related Company)
