US Plant Patent PP42
Grape
PUBLIC DOMAIN
Patent expired November 8, 1949. This plant is in the public domain — anyone may propagate and sell it.
Twenty years from the filing date would end on April 20, 1952, but this patent ends 894 days earlier — a terminal disclaimer gives term back. A source that calculates twenty years from filing would tell you this plant is still protected when it is already free.
The record
- Patent number
- PP42
- Filed
- April 20, 1932
- Granted
- November 8, 1932
- Expires
- November 8, 1949
- Assignee
- WIEDERKEHR HERMAN J B
- Inventor
- WIEDERKEHR HERMAN J B
No cultivar name of record
This patent does not name the plant, and for its era that is ordinary rather than an omission. Before about 1980, breeders frequently patented a plant without giving it a cultivar name at all — the grant identified it by its number, its parentage and a written description of the flower and foliage. Most plant patents from the 1930s to the 1970s have no name in them.
Nothing here is missing from our records: the patent itself states no name. Where one exists we show it, and we do not invent one.
Read the full patent: US Plant Patent PP42 in full — the complete specification, every figure, and the file history.