US 4970981
CHUTE RIVER MINE SWEEP
Assignee
Filed
Aug 26, 1968
Granted
Nov 20, 1990
Location
Abstract
A water fillable chute, to be employed as a submerged tractor device is cected to a plurality of wire severing grapnels by means of a metallic chain for sweeping command type river mines.
Source: Google Patents
35 USC §181 Secrecy Order
Imposed
Jan 22, 1982
Rescinded
Jun 8, 1990
Duration
8 years, 4 months
Record Details
- Patent number
- US 4970981
- Application
- 04756348
- 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