US Plant Patent PP19589
Royal Lynn
Cherry tree named ‘Royal Lynn’
UNDER PATENT
Still under patent. Protection ends July 14, 2027.
Twenty years from the filing date would end on January 22, 2027. This patent earned 173 days of term adjustment for delay at the Patent Office, which is why it runs longer.

The record
- Patent number
- PP19589
- Filed
- January 22, 2007
- Granted
- December 23, 2008
- Expires
- July 14, 2027
- Inventor
- ZAIGER GARY NEIL; GARDNER LEITH MARIE; ZAIGER GRANT GENE
Abstract
A new and distinct variety of cherry tree ( Prunus avium ). The following features of the tree and its fruit are characterized with the tree budded on ‘Mahaleb’ Rootstock (non-patented), grown on Handford sandy loam soil with Storie Index rating 95, in USDA Hardiness Zone 9, near Modesto, Calif., with standard commercial fruit growing practices, such as pruning, thinning, spraying, irrigation and fertilization. Its novelty consists of the following combination of desirable features: 1. Fruit maturity in the early season. 2. Heavy and regular production of fruit. 3. Fruit with an attractive red skin color. 4. Early blooming with a low winter chilling requirement of approximately 500 hours at or below 45° F. 5. Fruit with good flavor and eating quality. 6. Firm fruit with good handling and storage ability.
Show the legal claimThe single numbered claim as granted — the legal text that defines what this patent covers.
1. A new and distinct variety of cherry tree, substantially as illustrated and described, characterized by its large size, vigorous upright growth, having a low winter chilling requirement of approximately 500 hours at or below 45° F. and being a regular and productive bearer of medium to large size fruit that ripens in the early maturity season; the fruit is further characterized by its attractive red skin color, its firm flesh that has the ability to remain firm on the tree 10 days past maturity (shipping ripe) with good flavor and eating quality, and in comparison to its parent ‘Royal Lee’ Cherry (U.S. Plant Pat. No. 2,417) the fruit of the new variety is approximately 2 days earlier in maturity and slightly larger in size.
Read the full patent: US Plant Patent PP19589 in full — the complete specification, every figure, and the file history.