Refine My Results

Creation Date 

1. Before 1960  (556)
2. 1960 To 1975  (3,816)
3. 1976 To 1991  (138,704)
4. 1992 To 2008  (879,622)
5. After 2008  (2,495,060)
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New Records 

1. New From Last Month  (3,038)
2. New From Last 3 Month  (64,511)
3. More options 

Subject 

1. Transporting  (916,859)
2. Performing Operations  (916,859)
3. Physics  (726,843)
4. Electricity  (725,234)
5. Chemistry  (552,316)
6. Metallurgy  (552,316)
7. Lighting  (424,734)
8. Weapons  (424,734)
9. Blasting  (424,734)
10. Heating  (424,734)
11. Mechanical Engineering  (424,734)
12. Human Necessities  (418,129)
13. Basic Electric Elements  (330,801)
14. Calculating  (253,477)
15. Computing  (253,477)
16. Counting  (253,477)
17. Fixed Constructions  (233,554)
18. Measuring  (228,962)
19. Testing  (228,962)
20. Electric Communication Technique  (207,846)
21. More options 

Databases 

1. esp@cenet  (3,339,096)
2. USPTO Published Applications  (95,467)
3. USPTO Issued Patents  (82,709)
4. Fraunhofer-ePrints  (515)
5. Calhoun: The NPS Institutional Archive  (4)
6. SWEPUB Freely available online  (3)
7. SHAREOK Repository  (2)
8. RAIITH  (1)
9. PolyU Institutional Research Archive  (1)
10. Spiral  (1)
11. More options 

Language 

1. English  (3,339,197)
2. Chinese  (1,602,841)
3. French  (187,662)
4. Korean  (149,662)
5. German  (115,251)
6. Japanese  (92,577)
7. Russian  (22,455)
8. Portuguese  (10,586)
9. Spanish  (6,372)
10. Italian  (3,784)
11. Danish  (1,695)
12. Swedish  (1,476)
13. Norwegian  (1,324)
14. Polish  (1,221)
15. Finnish  (1,127)
16. Ukrainian  (816)
17. Dutch  (737)
18. Hebrew  (666)
19. Hungarian  (466)
20. More options