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John Rene Spronken

UN Unknown: 1 patents #29,356 of 83,584Top 40%
📍 Calgary, CA: #162 of 5,407 inventorsTop 3%
Overall (All Time): #246,178 of 4,157,543Top 6%
18
Patents All Time

Issued Patents All Time

Showing 1–18 of 18 patents

Patent #TitleCo-InventorsDate
D1073444 Connector element 2025-05-06
D1004403 Connector element 2023-11-14
D973297 Crane base fastener 2022-12-20
D916419 Universal spreader bar 2021-04-13
D874082 Crane tie-arm 2020-01-28
10508005 Assembly for lifting or supporting a load, and members and connectors for use in same 2019-12-17
10422465 Prefabricated reusable concrete pedestal element 2019-09-24
D858026 Universal spreader bar 2019-08-27
10202734 Prefabricated resuable concrete pedestal element 2019-02-12
D835878 Crane base 2018-12-11
10139037 Prefabricated reusable concrete pedestal element 2018-11-27
D811208 Crane base fastener 2018-02-27
9851049 Crane tie arm adjustment 2017-12-26
5590503 Non-composite panel 1997-01-07
5118060 Adjustable bracket for building construction 1992-06-02
4989382 Connectors for concrete structural elements 1991-02-05
4922676 Closure and seal for prefabricated building panels 1990-05-08
4898358 Form-work for concrete 1990-02-06