THE PILOT INK COMPANY, LIMITED
175Patents
52Active
175Granted
45Portfolio score
Filing activity: Dec 23, 1975 → Mar 17, 2022 · 31 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4028118A | Thermochromic materials | Emerging Cross-Sectional Technologies | 183 | Expired |
| US4681791A | Thermochromic textile material | Emerging Cross-Sectional Technologies | 113 | Expired |
| US4421560A | Thermochromatic materials | Chemistry; Metallurgy | 105 | Expired |
| US5219625A | Thermochromic laminate member and toy utilizing the same | Emerging Cross-Sectional Technologies | 95 | Expired |
| US4720301A | Reversible heat sensitive recording composition | Performing Operations; Transporting | 93 | Expired |
| USD489088S1 | Ball-point pen | General | 71 | Expired |
| USD472577S1 | Ball-point pen | General | 66 | Expired |
| US5558700A | Reversible thermochromic composition | Emerging Cross-Sectional Technologies | 58 | Expired |
| US5466283A | Aqueous ink composition for writing instrument | Chemistry; Metallurgy | 55 | Expired |
| USD286547S | Pen | General | 54 | Expired |
| US4920991A | Thermochromic artificial nail | Emerging Cross-Sectional Technologies | 54 | Expired |
| USD484537S1 | Ball-point pen | General | 53 | Expired |
| US5153066A | Temperature-sensitive color-changeable composite fiber | Emerging Cross-Sectional Technologies | 50 | Expired |
| USD462386S1 | Ball-point pen | General | 49 | Expired |
| US5928803A | Temperature-sensitive reversibly deformable laminate | Emerging Cross-Sectional Technologies | 49 | Expired |
| USD363308S | Ball-point pen | General | 47 | Expired |
| US6228804A | Color-change materials | Physics | 47 | Expired |
| US6494950B1 | Thermochromic microencapsulated pigments | Emerging Cross-Sectional Technologies | 45 | Expired |
| US4732810A | Reversible temperature-indicating composition | Emerging Cross-Sectional Technologies | 44 | Expired |
| USD378761S | Ball-point pen | General | 43 | Expired |
| USD290979S | Toy cow | General | 42 | Expired |
| US6416853B1 | Color-change laminates and toy sets with the use thereof | Emerging Cross-Sectional Technologies | 39 | Expired |
| US5011445A | Color memory toy set | Emerging Cross-Sectional Technologies | 37 | Expired |
| US5785746A | Preparation method for shear-thinning water-based ball-point pen inks compositions and ball-point pens employing the same | Chemistry; Metallurgy | 37 | Expired |
| US5352649A | Thermochromic laminate member, and composition and sheet for producing the same | Emerging Cross-Sectional Technologies | 36 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.