Squirrel proof bird feeder
Patent 6591781 Issued on July 15, 2003. Estimated Expiration Date: 
August 14, 2021. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
August 14, 2021. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2856898 2891508 3117554 3124103 4030451 Squirrel-proof post Bird feeder Bird feeding device Squirrel-proof selective bird feeder Selective bird feeder InventorAssigneeApplicationNo. 929762 filed on 08/14/2001US Classes:119/57.9, And feature for excluding undesirable animal119/52.3And feature for excluding undesirable animalExaminersPrimary: Poon, Peter M.Assistant: Piascik, Susan Attorney, Agent or FirmInternational ClassA01K 061/02AbstractA bird feeder which utilizes a shielding collar that behaves substantially like a universal-joint. The hollow, generally-cylindrical collar surrounds an annular food tray. The collar has a plurality of openings to provide access to the food tray, with a perch rod adjacent each opening. The collar is suspended by a spring device operative to allow the collar to simultaneously tilt, move downwardly and rotate, thus occluding the passage to food whenever the weight and agitated movements of a squirrel are brought to bear upon the collar. | |
