MALZINE CO., LTD.
109Patents
40Active
109Granted
50Portfolio score
Filing activity: May 27, 1975 → Jun 9, 2023 · 7 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4979498A | Video cervicoscope system | Human Necessities | 85 | Expired |
| US5167246A | Rapidly erectable and strikeable shelter frame system and methods of erecting and striking such systems | Emerging Cross-Sectional Technologies | 63 | Expired |
| US5495357A | Apparatus and method for recording, transmitting, receiving and playing sounds | Electricity | 51 | Expired |
| US5443017A | Adjustable work table and modular system for the assembly thereof | Human Necessities | 50 | Expired |
| US5190305A | Luggage handling hand cart | Emerging Cross-Sectional Technologies | 42 | Expired |
| US5207439A | Improvements in hand trucks with pivotally connected, spreadable, wheel-supported, auxiliary support frames | Performing Operations; Transporting | 42 | Expired |
| US5913527A | Hand trucks having multiple, foldable bottle-carrying trays and methods of constructing the hand trucks | Performing Operations; Transporting | 39 | Expired |
| US5253410A | Retractable underbody truck ramp and method of making | Emerging Cross-Sectional Technologies | 39 | Expired |
| US8282111B2 | Cart with movable platform | Performing Operations; Transporting | 39 | Active |
| US5313557A | Pen recorder | Physics | 37 | Expired |
| US8042829B2 | Cart for loads | Performing Operations; Transporting | 36 | Active |
| US5277436A | Combination hand truck and stair ramp | Performing Operations; Transporting | 33 | Expired |
| US4762333A | Repositionable hand truck | Performing Operations; Transporting | 31 | Expired |
| US6302414A | Multiple use hand trucks fitted with detachable bottled water carrier tray and methods of their construction and use | Performing Operations; Transporting | 29 | Expired |
| USD715822S1 | Display screen with transitional graphical user interface | General | 28 | Active |
| US3997182A | Two-wheeled hand trucks | Performing Operations; Transporting | 28 | Expired |
| US4078676A | Self storing lift gate assembly | Emerging Cross-Sectional Technologies | 27 | Expired |
| US6019381A | Multiple use hand trucks fitted to carry laundry baskets | Performing Operations; Transporting | 26 | Expired |
| US8894076B2 | Cart with movable platform | Performing Operations; Transporting | 24 | Active |
| US4821424A | Drafting instrument | Performing Operations; Transporting | 23 | Expired |
| US5393081A | Hand truck assemblies and methods of constructing and operating them | Performing Operations; Transporting | 23 | Expired |
| US6601859B2 | Vertically folding hand truck and methods of its operation and construction | Performing Operations; Transporting | 23 | Expired |
| US4121855A | Hand truck construction | Performing Operations; Transporting | 23 | Expired |
| US4275894A | Hand truck construction assembly | Performing Operations; Transporting | 22 | Expired |
| US5330147A | Video monitor clamp | Emerging Cross-Sectional Technologies | 22 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.