Paul Michael Cunningham

US Patent:

48674273, Sep 19, 1989

Filed:

Aug 1, 1988

Appl. No.:

7/226940

Inventors:

Paul D. Cunningham - Moorestown NJ

International Classification:

B25B 100

US Classification:

269 88

Abstract:

A clamp adapted to engage a clamp receiving hole in a welding platen for tightly clamping a workpiece in a desired position. The clamp includes an elongated upright capable of extending into the hole, a stop member extending outwardly from a lower portion of the upright, the stop being wider than the mouth of the hole, thereby limiting the distance the upright extends into the hole, a clamping arm slidably mounted to the upright, the clamping arm comprising a frame portion, an elongated neck extending from the frame and a sleeve connected to the neck and engaging the upright, the sleeve permitting changes in the angular position of the neck with respect to the upright. The clamp further includes a threaded screw connected to the frame and capable of applying force to the workpiece wherein tightening of the threaded screw against the workpiece causes the clamping arm to pivot with respect to the upright, thereby causing the upright to tilt and tightly engage opposing sides of the hole which causes the upright to remain wedged in the hole and the workpiece to be tightly clamped.

US Patent:

20210332291, Oct 28, 2021

Filed:

Apr 23, 2021

Appl. No.:

17/238265

Inventors:

- Arlington VA, US
Sarah F. Brittman - Washington DC, US
Joseph G. Tischler - Alexandria VA, US
Patrick Y. Yee - Washington DC, US
Chase T. Ellis - Silver Spring MD, US
Paul D. Cunningham - Baltimore MD, US
Rhonda M. Stroud - Washington DC, US
Michael H. Stewart - Springfield VA, US
Steven C. Erwin - Alexandria VA, US

Assignee:

The Government of the United States of America, as represented by the Secretary of the Navy - Arlington VA

International Classification:

C09K 11/56
C09K 11/66
C09K 11/58

Abstract:

A process for synthesizing CuS/PbS core/shell nanocrystals. Pb-oleate is mixed with 1-octadecene and heated to 60 C. CuS core solution and bis(trimethylsilyl)sulfide stock solution are added and the mixture is stirred at 60 C. for 6 minutes to form the PbS shell around the CuS nanocrystal cores. The flask is cooled and acetonitrile and toluene is added and the mixture is centrifuged to precipitate and remove the CuS/PbS core/shell nanocrystals from the reaction mixture. The reaction also produces homogeneously nucleated PbS nanocrystals, which are removed from the CuS/PbS core/shell reaction mixture via size-selective precipitation. By tailoring the amounts of Pb-oleate and bis(trimethylsilyl)sulfide stock solution in the reaction vessel, while maintaining their molar ratio of 1.5:1 and the number of CuS cores in the reaction, CuS/PbS core/shell nanocrystals having a predetermined shell thickness of PbS, and thus a predetermined level of chemical stability, can be obtained.