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Patents for Henry L. Pratt
Patents 1 - 11 of 11
First set of recordsLast set of records
NumberDatePatenteeTitleType
60,207Dec. 04, 1866H.C. LewisImproved Countersink Bitcountersinks
90,759Jun. 01, 1869H.C. LewisSingle Twist Auger Bitauger bits
131,829Oct. 01, 1872H.L. PrattBit-stockbrace chucks
D8,381Jun. 08, 1875H.L. PrattDesign for Bracket Saw Framesframe saws
177,659May 23, 1876H.L. PrattImprovement in Scroll Saw Framescoping saws
194,109Aug. 14, 1877H.L. PrattImprovement in Drill-Chucksdrill chucks
200,757Feb. 26, 1878H.L. PrattImprovement in ratchet bit-bracesratchet braces
292,176Jan. 22, 1884H.L. PrattSaw fastening and framehacksaws
345,256Jul. 06, 1886H.L. PrattSaw Framehacksaws
438,860Oct. 21, 1890H.L. PrattAuger-Handleauger handles
502,996Aug. 08, 1893H.L. PrattHack-saw machinemetal sawing machines
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