Patent assignee · US · COMPANY

Photon Systems, Inc.

22Patents
17Active
22Granted
47Portfolio score

Filing activity: Apr 5, 1974 → Jul 13, 2021 · 2 expiring within 5 years

Most-cited patents

PatentTitleAreaCited byStatus
US3952437A Picture frame construction Human Necessities 36 Expired
US8759791B1 Native fluorescence detection methods and detectors for naphthalene and/or other volatile organic compound vapors Physics 29 Active
US7590161B1 Electron beam pumped semiconductor laser Physics 19 Expired
US7525653B1 Spectroscopic chemical analysis methods and apparatus Physics 18 Active
US8395770B1 Spectroscopic chemical analysis methods and apparatus Physics 15 Active
US3982825A Color filter head for photographic enlargers Physics 15 Expired
US9568418B1 Spectroscopic chemical analysis methods and apparatus Physics 14 Active
US9442070B1 Native fluorescence detection methods, devices, and systems for organic compounds Physics 13 Active
US7800753B1 Spectroscopic chemical analysis methods and apparatus Physics 11 Active
US9915603B1 Spectroscopic chemical analysis methods and apparatus Physics 7 Active
US10732037B1 Methods and apparatus for spectroscopic identification and/or calibrated quantification of surface concentration of materials Physics 7 Active
US11448598B1 Methods and systems for detection of biohazard signatures in complex clinical and environmental samples Physics 6 Active
US10598596B1 Native fluorescence detection methods, devices, and systems for organic compounds Physics 5 Active
US9909990B1 Native fluorescence detection methods, devices, and systems for organic compounds Physics 5 Active
US10753863B1 Spectroscopic chemical analysis methods and apparatus Electricity 3 Active
US4016585A Center filling variable volume film drum Physics 1 Expired
US10890533B1 Spectroscopic chemical analysis methods and apparatus Physics 0 Active
US11525731B1 Methods and apparatus for spectroscopic identification and/or calibrated quantification of surface concentration of materials Physics 0 Active
US11022490B1 Methods and apparatus for spectroscopic identification and/or calibrated quantification of surface concentration of materials Physics 0 Active
US3944363A Focusing device and method of use thereof for photographic enlarger Physics 0 Expired
US11262301B1 Native fluorescence detection methods, devices, and systems for organic compounds Physics 0 Active
US10895533B1 Native fluorescence detection methods, devices, and systems for organic compounds Physics 0 Active

Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.