Granted Patent
Utility
US 6,551,420
· Confirmation No. 5650
DUPLEX STAINLESS STEEL
Patented Case
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Inventors
David S. Bergstrom
Natrona Heights, PA
John J. Dunn
Sarver, PA
John F. Grubb
Lower Burrell, PA
William A. Pratt
Butler, PA
Attorneys & Agents of Record
Classification
USPC
148/325
C22C38/001
C22C38/40
C22C38/44
C21D2211/001
C21D2211/005
C22C38/42
C22C38/54
C22C38/58
Prosecution
- Examiner
- YEE, DEBORAH
- Art Unit
- 1742
- Docket No.
- RL-1991
- Confirmation No.
- 5650
Patent Term Adjustment
-27days
RELEASE OF SECURITY INTEREST
Recorded 2011-02-24
ASSIGNMENT OF ASSIGNOR'S INTEREST
Recorded 2002-01-14
ASSIGNMENT OF ASSIGNOR'S INTEREST
Recorded 2001-11-05
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Quick Facts
- Patent No.
- US 6,551,420
- App. No.
- 09/981,074
- Filed
- 2001-10-16
- Granted
- 2003-04-22
- Examiner
- YEE, DEBORAH
- Art Unit
- 1742
- PTA
- -27 days
External Links