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Creation Date 

1. Before 1961  (223)
2. 1961 To 1976  (312)
3. 1977 To 1992  (1,800)
4. 1993 To 2009  (11,515)
5. After 2009  (51,480)
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New Records 

1. New From Last Week  (29)
2. New From Last Month  (1,035)
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Subject 

1. Structural Combinations Of Lighting Devices With Otherarticles, Not Otherwise Provided For  (51,648)
2. Functional Features Or Details Of Lighting Devices Or Systemsthereof  (51,648)
3. Electricity  (13,627)
4. Physics  (12,706)
5. Optics  (7,844)
6. Electric Techniques Not Otherwise Provided For  (6,753)
7. Electric Heating  (6,341)
8. Electric Lighting Not Otherwise Provided For  (6,341)
9. Transporting  (6,133)
10. Performing Operations  (6,133)
11. Optical Elements, Systems, Or Apparatus  (5,994)
12. Basic Electric Elements  (5,203)
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Language 

1. English  (59,846)
2. Chinese  (28,538)
3. French  (8,324)
4. German  (6,025)
5. Japanese  (5,561)
6. Korean  (2,148)
7. Spanish  (406)
8. Russian  (257)
9. Portuguese  (124)
10. Italian  (96)
11. Danish  (67)
12. Polish  (58)
13. Dutch  (36)
14. Swedish  (31)
15. Finnish  (26)
16. Hungarian  (15)
17. Czech  (13)
18. Norwegian  (13)
19. Slovenian  (13)
20. Croatian  (9)
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