Electric filter
Patent 4077784 Issued on March 7, 1978. Estimated Expiration Date: 
March 7, 1995. 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.
March 7, 1995. 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 2868319 2974747 3757802 3807144 InventorApplicationNo. 05/617816 filed on 09/29/1975US Classes:96/88, With insulation feature128/205.29, Particulate filtering131/187, Cigar and cigarette holders131/333, By electric, magnetic, or radioactive action55/417ValveExaminersPrimary: Lutter, Frank W.Assistant: Lacey, David L. Attorney, Agent or FirmForeign Application Priority Data1974-02-10 SFAbstractAn electric filter for separating impurities from air including a housing which contains separator plates disposed in spaced relationship and formed of conductive material and alternate ones of said plates are connected to opposite poles of a source of voltage. | |
