Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
DH

Douglas D. Hamilton — 10 Patents

LDLogging Development: 6 patents #1 of 3Top 35%
CLCanadian Patents And Development Limited: 1 patents #88 of 449Top 20%
ESElevator Safety: 1 patents #5 of 9Top 60%
Montréal, CA: #389 of 4,862 inventorsTop 9%
Overall (All Time): #481,000 of 4,157,543Top 15%
10 Patents All Time
Douglas D. Hamilton has been granted 10 US patents while listed as an inventor at Logging Development. The first was granted in 1986 and the most recent in August 2022. Douglas D. Hamilton ranks #481,000 of 4,157,543 US inventors in our database (top 11.6%). Patent records list Douglas D. Hamilton in Montréal, QC, CA.

Issued Patents All Time

Showing 1–10 of 10 patents

Patent #TitleCo-InventorsDate
11407615 Elevator guide Andrew James Laughton, Jeffrey Lachica Geroso, Tyler Stine, Antonio Alexander Witt 2022-08-09
5377730 Apparatus to stabilize a cut tree in the vertical position during movement by a feller-buncher 1995-01-03
5161588 Tree felling head with combination tree accumulator and tree abutment 1992-11-10
5129438 Boom mounted type tree processing head and mounting therefore 1992-07-14
5044409 Force matching tree shear 1991-09-03
5026248 Hydrodynamic swing damper and tree handling vehicle incorporating the same 1991-06-25
5004026 Felling head Charles D. MacLennan, Robert M. Palfy 1991-04-02
4717081 Tree residue processor 1988-01-05
4690185 Rim driven rotary cutter and tree felling head incorporating the same Robert M. Palfy, Hans Viereck 1987-09-01
4593733 Tree felling head having a rim driven rotary cutter 1986-06-10