HELM JOHN has a total of 12 patent applications. Its first patent ever was published in 1903. It filed its patents most often in United States, United Kingdom and Canada. Its main competitors in its focus markets civil engineering are KONINK MIJ TOT HET UITVOEREN V, FAILLA IGNAZIO and MARINE RESOURCES EXPLORATION INTERNAT BV.
# | Country | Total Patents | |
---|---|---|---|
#1 | United States | 9 | |
#2 | United Kingdom | 2 | |
#3 | Canada | 1 |
# | Industry | |
---|---|---|
#1 | Civil engineering |
# | Technology | |
---|---|---|
#1 | Dredging | |
#2 | Earth drilling |
# | Name | Total Patents |
---|---|---|
#1 | Helm John | 12 |
Publication | Filing date | Title |
---|---|---|
US1200612A | Pipe-wrench. | |
US1031261A | Pipe-wrench. | |
US848743A | Excavating bucket and cutter. | |
US848742A | Excavating-machine. | |
GB190520090A | Improvements in Excavating Machines. | |
CA98718A | Excavator | |
US821413A | Excavating-machine. | |
US801007A | Excavating-machine. | |
US802985A | Excavating-machine. | |
GB190409031A | Improvements in Excavating Machines. | |
US777204A | Excavating-machine. | |
US757459A | Trench-digger. |