Secret Patents
© Brooke Clarke, N6GCE 2004- 2021
Background
If an inventor (either private
or government employee) files a patent application for a
technology that the government feels it wants to keep secret,
the patent will be put on hold. The SIGSALY (aka Green
Hornet) voice security system patents were held for about 35
years! Following is a list of patents have have been
held for at least 10 years.
PAT. NO. |
Title
|
6,707,871 |
Nuclear
reactor |
6,707,052 |
Infrared
deception countermeasure system |
6,706,089 |
Disposal
unit |
6,697,448 |
Neutronic
fuel element fabrication |
6,687,324 |
Coated
metal articles |
6,650,270 |
Radar
system |
6,598,554 |
Submarine
towed measuring system |
6,525,579 |
Pulse
translational circuits |
6,518,912 |
Signal
processing circuit |
6,420,995 |
Radar
and IFF system |
6,382,555 |
Fiber
optics assembly |
6,313,782 |
Coded
phase modulation communications system |
6,234,014 |
Method
and apparatus for analyzing gas flow through conduits
|
6,226,341 |
Safety
device for a neutronic reactor |
6,222,898 |
Jacketing
process |
6,212,250 |
Fuel
element closure method |
6,201,846 |
Method
of jacketing |
6,192,128 |
Current-sensitive
telephone-line disconnect system |
6,175,625 |
Control
circuits for electric coding machines |
6,133,411 |
Slurry
mixture forming an additive for producing a
hydrodynamic drag reduction aqueous polymer solution |
6,118,732 |
Secure
marine communication system |
6,081,574 |
Void
forming pyrolytic carbon coating process |
6,040,801 |
Low
duty cycle navigation system |
5,886,339 |
Missile
attitude safing system |
5,886,287 |
Guidance
information analyzer |
5,886,286 |
Monitoring
safety system |
5,886,285 |
Variable
range timer impact safety system |
5,886,284 |
Missile
safety system for assuring minimum safe distance |
5,805,635 |
Secure
communication system |
5,711,146 |
Hydrogen
peroxide decomposition |
5,679,921 |
Infra-red
tracking flare |
5,641,936 |
Active
infrared fuze |
5,638,076 |
Automatic
range reducing gating system |
5,597,245 |
Cavitation
suppressing ducted propeller system |
5,574,460 |
Manual
probe acquisition system |
5,543,488 |
Water-dispersible
adhesive composition and process |
5,526,323 |
Method
and apparatus for interpretation of sonar signals |
5,515,785 |
Charge
carrying flechette projectile |
H1,519 |
Transparent
ceramic composite armor |
5,493,612 |
Secure
communication keying system |
5,469,773 |
Light
weight armor |
5,456,156 |
Ceramic
armor |
5,450,794 |
Method
for improving the performance of underwater explosive
warheads |
5,448,643 |
Authenticaton
system |
5,439,188 |
Control
system |
5,423,497 |
Control
systems for moving bodies |
5,398,886 |
Control
systems for missiles and other moving bodies |
5,393,012 |
Control
systems for moving bodies |
5,393,011 |
Control
systems for moving bodies |
5,385,165 |
Hunting
blind |