The article presents an analysis of prospects of development of mobile crushers for utilization ofrice straw using the method of assessing engineering and technical significance of inventions. The method consists of study of retrospective patent fund for previous 10-15 years which allows to make forecast of possible ways of technology development for the next 10-15 years. Based on obtained data of a patent, there was designed the graph of change in level of prospects of combine harvesters and mobile crushers by years of research. The presented results of forecast data showed that development of mobile crushers is a promising trend.