SECRET OPTICAL MARKING
Assignee
Filed
Nov 1, 1969
Granted
Nov 1, 1994
Location
Abstract
An optical marking system in which objects are coated with materials for purposes of applying secretly coded marks on the objects. The coating materials are transparent in daylight and have the property of absorbing ultraviolet light. When such materials are applied to a portion of the surface of an object which is a good ultraviolet reflector, only the uncoated portion reflects ultraviolet. Thus, the marked object is therefore seen as having the coated portion blocked-out when viewed through a device which filters out all but ultraviolet wavelengths but appears to be unmarked when observed without the viewing device. Similar coding of objects may be achieved by appropriately selected paints, papers and other materials.
Source: Google Patents
35 USC §181 Secrecy Order
Imposed
Jan 15, 1982
Rescinded
Feb 22, 1994
Duration
12 years, 1 month
Record Details
- Patent number
- US 5360235
- Application
- 04870568
- Aerospace match
- Yes
- Dataset source
- 35 USC §181 SO records
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