USD225554S - Hydraulic jack for prestressing concrete - Google Patents
Hydraulic jack for prestressing concrete Download PDFInfo
- Publication number
- USD225554S USD225554S US D225554 S USD225554 S US D225554S
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- US
- United States
- Prior art keywords
- hydraulic jack
- prestressing concrete
- prestressing
- concrete
- howlett
- Prior art date
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Des. 225,554
Patented Dec. 19, 1972 United States Patent Ofiice HYDRAULIC JACK FOR PRESTRESSING CONCRETE James W. Howlett, Oakland, Calif., assignor to Howlett Machine Works Filed July 6, 1971, Ser. No. 160,255
Term of patent 14 years Int. Cl. D1504 US. Cl. D41-3 Des 225,554
. PAGE 3 Fig.5
Fig.6
I claim: The ornamental design for a hydraulic jack for prestressing concrete, as shown and described.
References Cited UNITED STATES PATENTS 3,347,521 10/1967 Bingham 254-29R 3,008,227 11/1961 Fielders. 3,381,478 5/1968 Wells.
WALLACE R. BURKE, Primary Examiner W. N. WERTMAN, Assistant Examiner
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