Patents by Inventor Sherry L. Crandall

Sherry L. Crandall has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

Method and apparatus for maintaining, and updating in-memory copies of the first and second pointers to reference the new versions of the first and second control structures that indicate available and allocated portions of usable space in the data file

Patent number: 7185029

Abstract: Method and apparatus for expanding usable space for an application data file. A control file is maintained with control structures that indicate available and allocated portions of usable space in the data file, along with quantities of available space in portions of the data file. Access to the control structures is limited while the file is undergoing expansion. Space is allocated in the control file for new versions of control structures, and the contents of the control structures are copied to the space for the new versions of the control structures. Pointers that reference the control structures and that are maintained in the control file are updated to reference the new versions of the first and second control structures.

Type: Grant

Filed: June 27, 2003

Date of Patent: February 27, 2007

Assignee: Unisys Corporation

Inventors: Scott L. Titus, Sherry L. Crandall

Method and apparatus for maintaining, and updating in-memory copies of the first and second pointers to reference the new versions of the first and second control structures that indicate available and allocated portions of usable space in the data file