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The ornamental design for a threaded heatless concentrator, as shown and described. |
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FIG. 1 is a front elevational view of a threaded heatless concentrator, showing my new design;
FIG. 2 is a side elevational view thereof, turned 90° with respect to FIG. 1;
FIG. 3 is a top plan view thereof;
FIG. 4 is a bottom plan view thereof; and
FIG. 5 is a perspective view thereof.
| Patent | Priority | Assignee | Title |
| Patent | Priority | Assignee | Title |
| 4391779, | Jul 06 1981 | Bel-Art Products | Teflon ground glass adaptor |
| D296241, | Apr 15 1985 | Bel-Art Products | Laboratory glass joint |
| Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
| Dec 16 1987 | Supelco, Inc. | (assignment on the face of the patent) | ||||
| Dec 16 1987 | SPOCK, PAUL S | SUPELCO INC , A DE CORP | ASSIGNMENT OF ASSIGNORS INTEREST | 005432 | 0883 | |
| May 06 1993 | SUPELCO, INC | S A C CORPORATION | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 006554 | 0035 | |
| May 13 1993 | S A C CORPORATION | SUPELCO, INC | CHANGE OF NAME SEE DOCUMENT FOR DETAILS | 007082 | 0090 | |
| Apr 08 1997 | SUPELCO, INC | Sigma-Aldrich Company | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 008595 | 0174 |
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