IP Library Granted Patent US 6,564,520
Granted Patent Utility PCT National Stage
US 6,564,520 · Confirmation No. 8928

SHEET-LIKE MASONRY BLOCK DRAINAGE SYSTEM

Patented Case View Patent ↗
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Code Description Pages PDF
2001-09-06 ABST Abstract 1 View
2001-09-06 LET. Miscellaneous Incoming Letter 33 View
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Quick Facts
Patent No.
US 6,564,520
App. No.
09/869,821
Filed
2001-09-06
Effective Filing
2001-07-05
Granted
2003-05-20
Art Unit
3635
PTA
0 days