Section 9--510. Effectiveness of Filed Record.
    (a) Filed  record effective if authorized. A filed record is effective
  only to the extent that it was filed by a person that may file it  under
  Section 9--509.
    (b) Authorization  by one secured party of record. A record authorized
  by one secured party of record does not affect the  financing  statement
  with respect to another secured party of record.
    (c) Continuation  statement not timely filed. A continuation statement
  that is not filed within the  six-month  period  prescribed  by  Section
  9--515(d) is ineffective.