David A. Hall
30Patents
8h-index
20Co-inventors
75Inventor score
Filing activity: Sep 9, 1974 → Nov 9, 2018
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5876078A | Bumper and front rail assembly for vehicle | Performing Operations; Transporting | 65 | Expired |
| US5876077A | Bumper and front rail assembly for vehicle | Performing Operations; Transporting | 40 | Expired |
| US4031097A | Descarboxylysergic acid | Chemistry; Metallurgy | 17 | Expired |
| US5464198A | Torsional vibration damper having helical torsion springs | Mechanical Engineering; Lighting; Heating | 15 | Expired |
| US4588484A | Electrochemical reduction of 3-chlorobenzo[b]thiophenes | Chemistry; Metallurgy | 14 | Expired |
| US4042472A | Electrolytic process for 7-methoxy-3-exomethylenecepham compounds | Chemistry; Metallurgy | 12 | Expired |
| US4989863A | Games table | Human Necessities | 12 | Expired |
| US5605557A | Conditioning composition and catalyst for use therewith | Emerging Cross-Sectional Technologies | 9 | Expired |
| US5375934A | Replacement bearing for worn shafts | Mechanical Engineering; Lighting; Heating | 8 | Expired |
| US4459405A | Desacetylcephalosporin sulfones | Chemistry; Metallurgy | 7 | Expired |
| US4694941A | Drive hub for torque converter clutch | Mechanical Engineering; Lighting; Heating | 7 | Expired |
| US4379739A | Electrolytic reduction of cephalosporin p-nitrobenzyl esters | Chemistry; Metallurgy | 5 | Expired |
| US5743935A | Conditioning composition | Emerging Cross-Sectional Technologies | 5 | Expired |
| US5062720A | Replacement bearing for worn shafts | Mechanical Engineering; Lighting; Heating | 4 | Expired |
| US4992545A | Process for preparing 4-substituted azetidinones | Chemistry; Metallurgy | 3 | Expired |
| US4525304A | Process for preparing oxazolinoazetidinones | Chemistry; Metallurgy | 3 | Expired |
| USD303277S | Games table | General | 2 | Expired |
| US5741750A | Conditioning composition and catalyst for use therewith | Emerging Cross-Sectional Technologies | 2 | Expired |
| US3954772A | Descarboxylysergic acid | Chemistry; Metallurgy | 2 | Expired |
| US4458071A | Process for 1-oxa-.beta.-lactams | Emerging Cross-Sectional Technologies | 1 | Expired |
| US4402803A | Process for 3-hydrogen cephems | Chemistry; Metallurgy | 1 | Expired |
| US4436596A | N-Substituted-2-(R)-(sulfinic acid)-3-(S)-(acylamido)-4-oxo-azetidines and process | Chemistry; Metallurgy | 1 | Expired |
| US3972793A | Continuous flow-through mercury cathode electrolysis cell | Chemistry; Metallurgy | 0 | Expired |
| US5106475A | Process for preparing 4-substituted azetidinones | Chemistry; Metallurgy | 0 | Expired |
| US4082627A | Electrolytic reduction of dihydrobenzopyranoxanthenones | Chemistry; Metallurgy | 0 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.