- Office of Patent Classification
- The US Patent Office's classification, which is likely a must when dealing with US patents, with the following software-related classes:
- 345: COMPUTER GRAPHICS PROCESSING AND SELECTIVE VISUAL DISPLAY SYSTEMS
- 700: DATA PROCESSING: GENERIC CONTROL SYSTEMS OR SPECIFIC APPLICATIONS (their caps!)
- 701: DATA PROCESSING: VEHICLES, NAVIGATION, AND RELATIVE LOCATION
- 702: DATA PROCESSING: MEASURING, CALIBRATING, OR TESTING
- 703: DATA PROCESSING: STRUCTURAL DESIGN, MODELING, SIMULATION, AND EMULATION
- 704: DATA PROCESSING: SPEECH SIGNAL PROCESSING, LINGUISTICS, LANGUAGE TRANSLATION, AND AUDIO COMPRESSION/DECOMPRESSION
- 705: DATA PROCESSING: FINANCIAL, BUSINESS PRACTICE, MANAGEMENT, OR COST/PRICE DETERMINATION
- 706: DATA PROCESSING: ARTIFICIAL INTELLIGENCE
- 707: DATA PROCESSING: DATABASE AND FILE MANAGEMENT OR DATA STRUCTURES
- 711: ELECTRICAL COMPUTERS AND DIGITAL PROCESSING SYSTEMS: MEMORY (e.g., 711/216 is hashing)
- 715: DATA PROCESSING: PRESENTATION PROCESSING OF DOCUMENT, OPERATOR INTERFACE PROCESSING, AND SCREEN SAVER DISPLAY PROCESSING
- 717: DATA PROCESSING: SOFTWARE DEVELOPMENT, INSTALLATION, AND MANAGEMENT
- 718: ELECTRICAL COMPUTERS AND DIGITAL PROCESSING SYSTEMS: VIRTUAL MACHINE TASK OR PROCESS MANAGEMENT OR TASK MANAGEMENT/CONTROL
- NIST's Guide to Available Mathematical Software
- The ACM Computing Classification System (1998) (Older versions also available)
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