US 4975890
UNDERWATER SOUND TRANSMITTING SYSTEM
Assignee
Filed
May 10, 1960
Granted
Dec 4, 1990
Location
Abstract
An underwater signalling device to fire explosives at a preselected depth a prearranged time sequence, which is intended to be part of an underwater sound communication system.
Source: Google Patents
35 USC §181 Secrecy Order
Imposed
Jul 22, 1982
Rescinded
Apr 5, 1990
Duration
7 years, 8 months
Record Details
- Patent number
- US 4975890
- Application
- 00402817
- Aerospace match
- No
- Dataset source
- 35 USC §181 SO records
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Back to patent indexSource: USPTO 35 USC §181 secrecy order records