|
The design for a air stone, as shown and described. |
FIG. 1 is a front perspective view of air stone showing my new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational thereof;
FIG. 4 is a side elevational view thereof, the opposite side being a mirror image of the side shown;
FIG. 5 is a top plan view thereof; and,
FIG. 6 is a bottom plan view thereof.
Patent | Priority | Assignee | Title |
ER3161, |
Patent | Priority | Assignee | Title |
1920220, | |||
2008363, | |||
2245495, | |||
2711714, | |||
3320928, | |||
3507253, | |||
3773015, | |||
4776127, | Aug 08 1986 | SHOULDA GONE FISHIN , A CORP OF TX | Aerator |
5034165, | Jul 26 1990 | TETRA HOLDING US , INC | Air stone |
5133906, | Oct 09 1990 | APOLLO ENTERPRISES, INC | Aerator |
D249897, | Jul 15 1977 | Willinger Bros., Inc. | Air stone |
DE2842865, | |||
DE955730, | |||
FR1037101, | |||
FR831518, | |||
SU721046, |
Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
Feb 27 1991 | NG, TONY T W | VENY PLASTIC CO , LIMITED | ASSIGNMENT OF ASSIGNORS INTEREST | 005720 | /0565 | |
Apr 24 1991 | Veny Plastic Co., Limited | (assignment on the face of the patent) | / |
Date | Maintenance Fee Events |
Date | Maintenance Schedule |