Squirrel-proof birdfeeder
US4821681A · kind A · utility
52Cited by
11References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 14, 1987 |
| Grant date | Apr 18, 1989 |
| Priority date | — |
| Expiry date | Jul 14, 2007 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA01K39/0113
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A birdfeeder includes a upwardly-opening tray (12) that has an center post or rod (14) affixed thereto and a cover or hood (16) supported on the post and biased by biasing member (32) towards an upward collar (20) with the biasing member accommodating tilting of the cover upon the application of an external force to eject the species that produces the external force.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.