Effective query generation and postprocessing strategies for prior art patent search

idf 0.0484 0.0534 0.0565 0.055 0.0546 0.0551 0.0549 0.0549 0.0549 0.0549 log(tf)idf 0.0326 0.0531 0.0583 0.0569 0.0556 0.0551 0.0549 0.0549 0.0549 0.0549 tf 0.0011 0.0048 0.013 0.0247 0.0378 0.0439 0.0495 0.0534 0.0559 0.0584 Claims idf 0.0359 0.0478 0.0498 0.0533 0.0569 0.0619 0.0636 0.06 0.0583 0.0593 log(tf)idf 0.0515 0.064 0.0675 0.0668 0.0641 0.0629 0.0607 0.0606 0.0563 0.0566 tf 0.0012 0.0011 0.0014 0.0018 0.0045 0.0072 0.0076 0.0072 0.0106 0.0116 Description idf 0.031 0.0466 0.0498 0.0492 0.0479 0.0487 0.048 0.0468 0.0484 0.0497 log(tf)idf 0.0535 0.0687 0.0718 0.0696 0.0743 0.0747 0.0769 0.074 0.0733 0.0721 Note. Some of the best performances are shown in boldface. TABLE 4. Recall at 100 (R@100) results of several configurations for selecting query terms from the {Title, Abstract, Claims, Description} fields of the