Patent Family of US5195598A#Date: 19 August 2019
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US5195598A
published19930323
filed19911223
Text Register
Title: Drill head assembly
Applicant:DEVALL DONALD L?[US] DEVALL, DONALD L
Inventor: DEVALL DONALD L?[US] DEVALL, DONALD L
IPC: E21C7/02
Priority:
  • 19911223:US81439991A
  • References Cited:
  • US3766991
  • US3779040
  • US3800887
  • US3901330
  • US4190116
  • US4416337
  • US4487271
  • Legal:
    • US 81439991A 1993_11_30CC CERTIFICATE OF CORRECTION
    • US 81439991A 1996_08_29FPAY+FEE PAYMENT Year of Fee Payment 4
    • US 81439991A 2000_09_22FPAY+FEE PAYMENT Year of Fee Payment 8
    • US 81439991A 2004_10_07REMI MAINTENANCE FEE REMINDER MAILED
    • US 81439991A 2005_03_23REIN+REINSTATEMENT AFTER MAINTENANCE FEE PAYMENT CONFIRMED
    • US 81439991A 2005_05_17FP _EXPIRED DUE TO FAILURE TO PAY MAINTENANCE FEE Effective DATE 20050323
    • US 81439991A 2005_09_26FPAY+FEE PAYMENT Year of Fee Payment 12
    • US 81439991A 2005_09_26SULP+SURCHARGE FOR LATE PAYMENT
    • US 81439991A 2005_10_10PRDP+PATENT REINSTATED DUE TO THE ACCEPTANCE OF A LATE MAINTENANCE FEE Effective DATE 20051014
    • US 81439991A 2005_10_14STCF INFORMATION ON STATUS_ PATENT GRANT Free Format Text PATENTED CASE
    Abstract:
    An improved rotary drill head assembly including a drill head cover having an upper portion, a rotatable drill retaining socket having an outer surface and a support member having an upper portion. The socket extends above the support member. A flinger attached to the upper portion of the support member and having an axial passage extending therethrough, a top cap having an axial passage extending therethrough. An arrangement for attaching the flinger to the top cap including a pin received by one of the flinger and the top cap. A top plate attached to the top cap. The top plate includes an arrangement to protect the pin from the outside environment and to hold the pin in place against axial movement. A sealing arrangement between the upper portion of the drill head cover and the flinger. The flinger, top cap, top plate and upper portion of the drill head cover may be coated with a ceramic material.
    results based on data supplied by the database INPADOC using OPEN PATENT SERVICES provided by the European Patent Office
    :