Unless someone tells me that cree owns a patent on SiC or on a unique way of manufacturing it
cree's patents cover crystal growth (SiC manufacturing) and a variety of SiC based devices.
cree's ceo and chief technology officer believe that the closest competition is at least 6 years behind.
here is a list...not certain it is 100% complete.
PATENT PROTECTION
This list of Cree's patents (Just U.S. I believe, they also possess 36 worldwide patents protecting their intellectual property). I don't know if this is a comprehensive list of US patents.
CREE
1 5,972,801 Process for reducing defects in oxide layers on silicon carbide
2 5,969,378 Latch-up free power UMOS-bipolar transistor
3 5,923,946 Recovery of surface-ready silicon carbide substrates
4 5,912,477 High efficiency light emitting diodes
5 5,838,706 Low-strain laser structures with group III nitride active layers
6 5,831,288 Silicon carbide metal-insulator semiconductor field effect transistor
7 5,812,105 Led dot matrix drive method and apparatus
8 5,776,837 Method of obtaining high quality silicon dioxide passivation on silicon carbide and resulting passivated structures
9 5,739,554 Double heterojunction light emitting diode with gallium nitride active layer
10 5,724,062 High resolution, high brightness light emitting diode display and method and producing the same
11 5,719,409 Silicon carbide metal-insulator semiconductor field effect transistor
12 5,718,760 Growth of colorless silicon carbide crystals
13 5,686,737 Self-aligned field-effect transistor for high frequency applications
14 5,679,153 Method for reducing micropipe formation in the epitaxial growth of silicon carbide and resulting silicon carbide structures
15 5,631,190 Method for producing high efficiency light-emitting diodes and resulting diode structures
16 5,629,531 Method of obtaining high quality silicon dioxide passivation on silicon carbide and resulting passivated structures
17 5,612,260 Method of obtaining high quality silicon dioxide passivation on silicon carbide and resulting passivated structures
18 5,604,135 Method of forming green light emitting diode in silicon carbide
19 5,592,501 Low-strain laser structures with group III nitride active layers
20 5,539,217 Silicon carbide thyristor
21 5,523,589 Vertical geometry light emitting diode with group III nitride active layer and extended lifetime
22 5,506,421 Power MOSFET in silicon carbide
23 5,465,249 Nonvolatile random access memory device having transistor and capacitor made in silicon carbide substrate
24 5,459,107 Method of obtaining high quality silicon dioxide passivation on silicon carbide and resulting passivated structures
25 5,416,342 Blue light-emitting diode with high external quantum efficiency
26 5,409,859 Method of forming platinum ohmic contact to p-type silicon carbide
27 5,393,993 Buffer structure between silicon carbide and gallium nitride and resulting semiconductor devices
28 5,381,103 System and method for accelerated degradation testing of semiconductor devices
29 5,359,345 Shuttered and cycled light emitting diode display and method of producing the same
30 5,338,944 Blue light-emitting diode with degenerate junction structure
31 5,270,554 High power high frequency metal-semiconductor field-effect transistor formed in silicon carbide
32 5,264,713 Junction field-effect transistor formed in silicon carbide
33 5,210,051 High efficiency light emitting diodes from bipolar gallium nitride
34 5,200,022 Method of improving mechanically prepared substrate surfaces of alpha silicon carbide for deposition of beta silicon carbide thereon and resulting product
35 5,155,062 Method for silicon carbide chemical vapor deposition using levitated wafer system
36 5,119,540 Apparatus for eliminating residual nitrogen contamination in epitaxial layers of silicon carbide and resulting product
37 5,093,576 High sensitivity ultraviolet radiation detector
38 5,061,972 Fast recovery high temperature rectifying diode formed in silicon carbide
39 5,027,168 Blue light emitting diode formed in silicon carbide
40 5,015,240 Hypodermic needle shield
41 5,008,735 Packaged diode for high temperature operation
42 4,966,862 Method of production of light emitting diodes
43 4,946,547 Method of preparing silicon carbide surfaces for crystal growth
44 4,918,497 Blue light emitting diode formed in silicon carbide ....
|
