MARUYAMA MFG. CO., INC.
61Patents
18Active
61Granted
44Portfolio score
Filing activity: Aug 21, 1974 → Aug 30, 2023 · 4 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| USD538824S1 | Reciprocating pump | General | 52 | Expired |
| USD591311S1 | Reciprocating pump | General | 48 | Expired |
| US6596159B1 | Automatic regeneration valve for water softener | Emerging Cross-Sectional Technologies | 46 | Expired |
| US6575695B1 | Centrifugal blower and power working machine | Performing Operations; Transporting | 39 | Expired |
| USD492759S1 | Air cleaner | General | 35 | Expired |
| USD496670S1 | Reciprocating pump | General | 32 | Expired |
| USD495342S1 | Reciprocating pump | General | 29 | Expired |
| US6370729B1 | Portable power working machine | Human Necessities | 24 | Expired |
| USD362600S | Bush cutter head | General | 22 | Expired |
| US6053091A | Plunger pump | Mechanical Engineering; Lighting; Heating | 19 | Expired |
| US5653028A | Saw blade machine and trimmer | Performing Operations; Transporting | 17 | Expired |
| USD858582S1 | Reciprocating pump | General | 16 | Active |
| USD533266S1 | Backpack blower | General | 16 | Expired |
| USD356013S | Hedge trimmer | General | 15 | Expired |
| USD532897S1 | Cover for a blower | General | 15 | Expired |
| US5517931A | Intermittently discharging method and reciprocating pump | Emerging Cross-Sectional Technologies | 11 | Expired |
| US6511286B2 | Centrifugal blower and portable power working machine | Mechanical Engineering; Lighting; Heating | 10 | Expired |
| USD347772S | Hedge trimmer | General | 10 | Expired |
| US4875690A | Seal device for reciprocating pump | Mechanical Engineering; Lighting; Heating | 10 | Expired |
| US3962089A | Apparatus for softening hard water | Performing Operations; Transporting | 10 | Expired |
| USD324221S | Internal combustion engine | General | 9 | Expired |
| USD353382S | Internal combustion engine | General | 9 | Expired |
| US6526624B2 | Blower tube for air-jet type cleaner | Human Necessities | 9 | Expired |
| US5641025A | Aerator for turf | Human Necessities | 9 | Expired |
| US5402576A | Mowing apparatus | Human Necessities | 9 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.