Refine My Results

Creation Date 

1. Before 1961  (72)
2. 1961 To 1975  (568)
3. 1976 To 1990  (18,352)
4. 1991 To 2006  (116,169)
5. After 2006  (419,967)
6. More options 

New Records 

1. New From Last Month  (524)
2. New From Last 3 Month  (10,414)
3. More options 

Subject 

1. Physics  (200,156)
2. Electricity  (159,132)
3. Transporting  (124,106)
4. Performing Operations  (124,106)
5. Lighting  (69,423)
6. Weapons  (69,423)
7. Blasting  (69,423)
8. Heating  (69,423)
9. Mechanical Engineering  (69,423)
10. Conversion Or Distribution Of Electric Power  (56,917)
11. Generation  (56,917)
12. Electric Communication Technique  (54,225)
13. Calculating  (49,298)
14. Computing  (49,298)
15. Counting  (49,298)
16. Measuring  (48,568)
17. Testing  (48,568)
18. Metallurgy  (46,500)
19. Chemistry  (46,500)
20. Human Necessities  (42,829)
21. More options 

Databases 

1. esp@cenet  (529,439)
2. USPTO Issued Patents  (14,382)
3. USPTO Published Applications  (11,268)
4. Fraunhofer-ePrints  (44)
5. Recercat  (2)
6. Spiral  (1)
7. RAIITH  (1)
8. Calhoun: The NPS Institutional Archive  (1)
9. More options 

Language 

1. English  (526,898)
2. Chinese  (234,708)
3. French  (32,681)
4. Korean  (26,832)
5. German  (20,548)
6. Japanese  (17,464)
7. Russian  (3,058)
8. Spanish  (2,229)
9. Portuguese  (1,177)
10. Italian  (558)
11. Swedish  (200)
12. Danish  (200)
13. Finnish  (169)
14. Norwegian  (159)
15. Polish  (133)
16. Ukrainian  (118)
17. Dutch  (83)
18. Bulgarian  (67)
19. Hebrew  (57)
20. More options