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- Undelivered mail 707.13; 1303.02
- Undue breadth rejection 2164.08; 2166; 2173.04; 2173.05(h)
- Unexpected results (See also Affidavits, traversing rejections (37 CFR 1.132)) 716.02 - 716.02(g)
- Unintentional abandonment (See Abandonment)
- United Kingdom priority document 213.03; 216
- United States Code (See Statutes)
- Unity of invention 803; 823; 1850; 1875; 1893.03(d)
- University or other institution of higher learning 509.02; 509.04(b)
- Unlocatable Patent or Application Files 508.04
- Unscheduled closing 213.03
- Unsigned amendment 711; 714.01(a)
- Untimely filed (premature) paper prior to order for ex parte reexamination 2225
- Untimely filed (premature) paper prior to order for inter partes reexamination 2625
- Untimely response to ex parte reexamination 2267
- Untimely response to inter partes reexamination 2667
- UPOV Convention (See also Plant patent and Treaties) 1612; 1613
- Uruguay Round Agreements Act (See also Treaties) 201.04; 715; 715.07(c); 2701; 2132
- Use claims 2173.05(q)
- Use, Public (See Public use)
- User pass 510
- USPTO Contact Center 1730
- Utility classes 902.02
- Utility, disclosure in drug cases 2107.03; 2164.06; 2164.06(a); 2164.07
- Utility requirement guidelines 2107
- Utility lacking, rejection 2104; 2107
- Utility model 901.05(b)
- Utility patent (See also Design application, Patent, and Plant patent) 901.04; 1502.01
- Application publication 1120 - 1135
- Copies of 707.05(a)
- Copyrighted material in 608.01(w)
- Design patent compared to 1502.01
- Double patenting 804
- Drawings / Photographs 608.01(f); 608.02
- Elements of 600
- Expiration date or term 1730; 2211; 2250
- Maintenance fees 2506
- Period of enforceability 2204; 2211
- Specification 608.01
- Application publication 1120 - 1135
- Utility required 608.01(p); 2104; 2107; 2164.07