Patent
   D312691
Priority
Dec 16 1987
Filed
Dec 16 1987
Issued
Dec 04 1990
Expiry
Dec 04 2004
Assg.orig
Entity
unknown
0
2
n/a
The ornamental design for a threaded heatless concentrator, as shown and described.

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.

Spock, Paul S.

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
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Executed onAssignorAssigneeConveyanceFrameReelDoc
Dec 16 1987Supelco, Inc.(assignment on the face of the patent)
Dec 16 1987SPOCK, PAUL S SUPELCO INC , A DE CORP ASSIGNMENT OF ASSIGNORS INTEREST 0054320883 pdf
May 06 1993SUPELCO, INC S A C CORPORATIONASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS 0065540035 pdf
May 13 1993S A C CORPORATIONSUPELCO, INC CHANGE OF NAME SEE DOCUMENT FOR DETAILS 0070820090 pdf
Apr 08 1997SUPELCO, INC Sigma-Aldrich CompanyASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS 0085950174 pdf
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