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LEFFER STAHL & APP

Overview
  • Total Patents
    63
About

LEFFER STAHL & APP has a total of 63 patent applications. Its first patent ever was published in 1967. It filed its patents most often in Germany, France and Austria. Its main competitors in its focus markets civil engineering, mechanical elements and machines are JIANGSU GOODENG ENGINEERING MACHINERY ASSEMBLING CO LTD, COTTBUS BAUWESEN HOCHSCHULE and GUOZHONG LI.

Patent filings per year

Chart showing LEFFER STAHL & APPs patent filings per year from 1900 to 2020

Top inventors

# Name Total Patents
#1 Blaschke Kurt 22
#2 Roob Josef 17
#3 Leffer Michael 7
#4 Buesching Rolf 2
#5 Leffer Michael Dipl Ing 2
#6 Leffer Hans Georg Dipl-Ing 1
#7 Zimmer Ottomar Heinrich 1
#8 Eisler Willibald 1
#9 Jung Bernhard Horst Dipl Ing 1
#10 Pennther Hermann Joseph 1

Latest patents

Publication Filing date Title
DE19817982C1 Formwork element of a flat joint formwork and method for its expansion
DE4309233C1 Method and device for precisely maintaining the vertical direction of excavation of a diaphragm wall
DE4308856C1 Drilling appts. for producing tubed deep bore, partic. for pile foundations - involves rope excavator with free fall device to which a tube rotary machine is linked
DE4303518A1 Method and device for solidifying a landfill of pre-compacted waste with the development of additional capacity for fresh waste
DE4032928A1 Pipe connection for drill pipes
DE4002907A1 Cylindrical cutting head forms extension of borehole drill pipe
DE3610792A1 Electrohydraulic control for a casing machine for cased bores in the ground
EP0105938A1 Support for tubes of a tube bundle inside a vessel
DE3201042A1 Hammer grab for producing holes in the earth
DE3105707A1 HYDRAULIC PIPING MACHINE FOR PILE FOUNDATIONS AND RELATED CONTROL
DE3031027A1 TENSION CLAMP FOR DRILL PIPES
ATA358079A Pipe drawing machine for pulling a drill pipe from the ground
US4202416A Method and apparatus for sinking a cased borehole for producing cased pile foundations
ATA369278A Pipe drawing machine
DE2815467A1 PIPE DRAWING MACHINE
DE2807510A1 DEVICE FOR THE STEP-BY-STEP PULLING OF RAMED STAKES, IN PARTICULAR H-BEAMS
DE2757940A1 Levelling control for raisable abutment beam in waterway lock - using two horizontally spaced pairs of unequal length electrodes immersed in conductive liq. container on beam
ATA569877A Device for depositing a piped deep hole for producing a piped foundation
DE2734185A1 PROCESS AND SYSTEM FOR DRILLING A PIPED DEEP DRILLING FOR THE PRODUCTION OF PIPED PILE FOUNDATIONS
DE2722075A1 Borehole auger drill for column foundations - has drive and clamp and hydraulic actuator for downwards movement