The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 29, 2010
Filed:
Jan. 07, 2004
Norman H. Margolus, Somerville, MA (US);
Jered J. Floyd, Cambridge, MA (US);
George E. Homsy, Ii, Cambridge, MA (US);
Jeffrey M. Keller, Cambridge, MA (US);
Norman H. Margolus, Somerville, MA (US);
Jered J. Floyd, Cambridge, MA (US);
George E. Homsy, II, Cambridge, MA (US);
Jeffrey M. Keller, Cambridge, MA (US);
Permabit Technology Corporation, Cambridge, MA (US);
Abstract
A method by which a disk-based distributed data storage system is organized for protecting historical records of stored data entities. The method comprises recording distinct states of an entity, corresponding to different moments of time, as separate entity versions coexisting within the distributed data storage system, and assigning expiration times to the entity versions independently within each of a plurality of storage sites according to a shared set of rules, before which times deletion is prohibited.