公开(公告)号：US3557961A

公开(公告)日：1971-01-26

申请号：US3557961D

申请日：1968-11-04

Applicant: FRED E STUART SR

Inventor： STUART FRED E SR

IPC: B01D24/38 ,  B01D23/16

CPC classification number: C02F1/004 ,  B01D24/14 ,  B01D24/4631 ,  B01D24/4673 ,  C02F1/283

Abstract: A method and apparatus for filtering water through a sand bed filter in which a layer of pulverized anthracite coal having a particle size larger than that of the sand particles is placed on top of the sand bed of the filter for the purpose of breaking up the floc in the water being filtered whereby the floc penetrates more deeply into the sand bed resulting in a longer service life for the filter bed before backwashing thereof is required.

公开(公告)号：US3434600A

公开(公告)日：1969-03-25

申请号：US3434600D

申请日：1966-01-24

Applicant: FRED E STUART SR

Inventor： STUART FRED E SR

IPC: B01D24/38 ,  C02F1/00 ,  C02B3/02 ,  B01D23/16 ,  B01D23/24

CPC classification number: B01D24/24 ,  B01D24/4621 ,  B01D24/4631 ,  B01D24/4673 ,  B01D24/4684 ,  B01D2201/583

公开(公告)号：US3557481A

公开(公告)日：1971-01-26

申请号：US3557481D

申请日：1968-09-12

Applicant: FRED E STUART SR

Inventor： STUART FRED E SR

IPC: F41C9/00

CPC classification number: F41C9/00 ,  F41C9/02

Abstract: A FIREARM DEVICE IN WHICH A TUBULAR ELEMENT FORMING A BARREL IS MOUNTED IN A SHOE HEEL OR SHOE SOLE AT THE REAR END OF THE SHOE AND RECEIVES A RIM FIRE CARTRIDE IN THE BACK END. THE CARTRIDGE CAN BE DETONATED BY A SHARP IMPACT ON THE BOTTOM OF THE HEEL OR THE REAR END OF THE HEEL.