Chemistry: analytical and immunological testing – Process or composition for determination of physical state... – Surface area – porosity – imperfection – or alteration
Reexamination Certificate
2004-01-20
2008-11-11
Griffin, Walter D (Department: 1797)
Chemistry: analytical and immunological testing
Process or composition for determination of physical state...
Surface area, porosity, imperfection, or alteration
C436S166000
Reexamination Certificate
active
07449336
ABSTRACT:
A method for testing for the presence of sol-gel on an aluminum test specimen includes: preparing an ammonium molybdate solution; preparing a hydrochloric acid solution; and mixing the solutions in 2:1 ratio in each of a number of receptacles. A test specimen of unknown coating, a first control specimen, and a second control specimen are placed in the mixed solution in three receptacles. The first control specimen has a sol-gel coating over an alodine coating; and the second control specimen has an alodine only coating. By timing events such as a change in color of the test and control specimens or the solution becoming opaque, the method determines that the test specimen of unknown coating has a like coating to that of a particular one of the control specimens if the timing of the event of the test specimen and the timing of the event of the particular control specimen are comparable.
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Davis Bruce R.
Jones Steven R.
Tomt Terry C.
Wire Richard G.
Fay III Theodore D.
Griffin Walter D
Mui Christine T
Plank Dennis R.
The Boeing Company
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