U.S. patents available from 1976 to present. U.S. patent
applications available from 2005 to present.  High performance
phosphorus-containing corrosion inhibitors for inhibiting
corrosion drilling system fluids  Patent 6558619 Issued on May
6, 2003. Estimated Expiration Date: Icon_subject August 9, 2019.
Estimated Expiration Date is calculated based on simple USPTO
term provisions. It does not account for terminal disclaimers,
term adjustments, failure to pay maintenance fees, or other
factors which might affect the term of a patent.
Abstract Claims Description Full Text  Patent References
Scale and corrosion inhibition for cooling water systems Patent
#: 3931038 Issued on: 01/06/1976 Inventor: Mochi-Bartolani ,  
et al.  Polyphosphate-based industrial cooling water treatment
Patent #: 4172032 Issued on: 10/23/1979 Inventor: Farley
Corrosion inhibitor for highly oxygenated systems Patent #:
4311662 Issued on: 01/19/1982 Inventor: Bellos  Method for
control of scale and inhibition of corrosion in cooling