Questech Corporation
25Patents
7Active
25Granted
39Portfolio score
Filing activity: Feb 16, 1977 → Feb 2, 2021 · 3 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5153726A | Recording and editing of moving television pictures | Physics | 36 | Expired |
| US5908505A | High volume, textured liquid transfer surface | Performing Operations; Transporting | 36 | Expired |
| US5663868A | Stackable electronic equipment assembly with improved circuit board cooling arrangement | Electricity | 30 | Expired |
| US4767902A | Method and apparatus for the microwave joining of ceramic items | Emerging Cross-Sectional Technologies | 28 | Expired |
| USD732375S1 | Switch plate assembly | General | 21 | Active |
| US5661489A | Enhanced electronically steerable beam-forming system | Electricity | 15 | Expired |
| US6239846A | Digital video effects, apparatus and method | Electricity | 14 | Expired |
| US4757172A | Method and apparatus for the microwave joining of nonoxide ceramic items | Emerging Cross-Sectional Technologies | 9 | Expired |
| US5293233A | Digital video effects with image mapping on to curved surface | Physics | 9 | Expired |
| USD823616S1 | Wall niche with centering devices and spacers | General | 7 | Active |
| US4918530A | Processing of video image signals | Electricity | 7 | Expired |
| US4847691A | Processing of video image signals | Physics | 7 | Expired |
| US4879597A | Processing of video image signals | Electricity | 6 | Expired |
| USD688935S1 | Switch plate assembly | General | 5 | Active |
| US4132113A | Navigation devices | Physics | 4 | Expired |
| US8323749B2 | Method for applying and curing by UV radiation a sealant system onto natural stone tiles to provide permanent sealing, protection, abrasion resistance, stain and mold resistance | Emerging Cross-Sectional Technologies | 4 | Active |
| US4964591A | Projectile having nonelectric infrared heat tracking device | Mechanical Engineering; Lighting; Heating | 3 | Expired |
| US5227884A | Processing of video image signals | Electricity | 3 | Expired |
| US5220428A | Digital video effects apparatus for image transposition | Electricity | 2 | Expired |
| US5822015A | Providing an accurate tally indication of sources in use for output | Electricity | 2 | Expired |
| US5524091A | Accurate digital divider | Physics | 1 | Expired |
| US8999507B2 | Method for applying and curing by UV radiation a sealant system onto natural stone tiles to provide permanent sealing, protection, abrasion resistance, stain and mold resistance, and natural stone tiles produced by the method | Emerging Cross-Sectional Technologies | 0 | Active |
| US11739234B2 | Natural stone sealer compositions | Chemistry; Metallurgy | 0 | Active |
| US10532956B2 | Natural stone sealer compositions | Chemistry; Metallurgy | 0 | Active |
| US5067133A | Error-correction of stored television signals | Physics | 0 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.