Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
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Leon Buchan — 6 Patents

UNUnknown: 1 patents #29,356 of 83,584Top 40%
Johannesburg, ZA: #34 of 591 inventorsTop 6%
Overall (All Time): #779,687 of 4,157,543Top 20%
6 Patents All Time
Leon Buchan has been granted 6 US patents while listed as an inventor at Unknown. The first was granted in 1989 and the most recent in July 2002. Leon Buchan ranks #779,687 of 4,157,543 US inventors in our database (top 18.8%). Patent records list Leon Buchan in Johannesburg, ZA.

Issued Patents All Time

Showing 1–6 of 6 patents

Patent #TitleCo-InventorsDate
6413416 Water treatment vessel with cartridge holder for holding tablets 2002-07-02
6123842 Dispensing of water treatment substances 2000-09-26
5201339 Treatment of liquids Joseph T. Webb 1993-04-13
5055183 Water treatment device 1991-10-08
5023012 Purification of water Pieter W. W. Buchan 1991-06-11
4842729 Treatment of liquids 1989-06-27