Pulverizing mills
Patent 3955766 Issued on May 11, 1976. Estimated Expiration Date: 
May 11, 1993. 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.
May 11, 1993. 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 252755 2092307 3221998 3268179 3339853 InventorApplicationNo. 188377 filed on 10/12/1971US Classes:241/56, Gas moving means and rotary comminuting element on same shaft241/114, Radial faces of plural rotary surfaces cooperate with common surface241/129Centrifugally urged toward contactExaminersPrimary: Custer, Granville Y. Jr.AbstractPulverizing apparatus comprising a vertical feed mechanism, a vertical mill cylinder in which raw material is fed, ground at one level, classified at another level and exhausted through a top portion to a collector and filter with particles of undesired sizes being returned to the mill for regrinding.Field of SearchWith recirculation of gas to comminuting zoneSuction applied above and coaxially of comminuting member or members Gas moving means and rotary comminuting element on same shaft Suction applied above and coaxially of comminuting member or members With material feeding mechanism or control Plural surfaces move across common surface Radial faces of plural rotary surfaces cooperate with common surface Centrifugally urged toward contact Rotors independently forcible away from common surface | |
