US Plant Patent PP28200
McDonald
Corylus plant named ‘McDonald’
UNDER PATENT
Still under patent. Protection ends January 24, 2036.
Twenty years from the filing date would end on January 13, 2035. This patent earned 376 days of term adjustment for delay at the Patent Office, which is why it runs longer.

The record
- Patent number
- PP28200
- Filed
- January 13, 2015
- Granted
- July 18, 2017
- Expires
- January 24, 2036
- Assignee
- UNIV OREGON STATE
- Inventor
- MEHLENBACHER SHAWN A; SMITH DAVID C; MCCLUSKEY REBECCA L
Abstract
A new and distinct Corylus plant named ‘McDonald’ characterized by moderate vigor and upright-spreading plant habit, yellowish-green developing and fully expanded leaves during the spring and summer, resistance to eastern filbert blight caused by the fungus Anisogramma anomala (Peck) E. Müller, presence of random amplified polymorphic DNA markers 152-800 and 268-580 in DNA, expression of incompatibility alleles S 2 and S 15 in the styles, and DNA fingerprints at 14 of 21 microsatellite marker loci differ from both parents, ‘Tonda Pacifica’ and ‘Santiam’, and from one parent at an additional 5 marker loci.
Show the legal claimThe single numbered claim as granted — the legal text that defines what this patent covers.
We claim: 1. A new and distinct cultivar of Corylus plant as herein illustrated and described.
Read the full patent: US Plant Patent PP28200 in full — the complete specification, every figure, and the file history.