USPTO serial 72252779
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This page summarizes the public USPTO record for this serial number, including owners, goods and services, and prosecution history.
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| Class | Description | Status | First use |
|---|---|---|---|
| 034 | HEAT EXCHANGERS DESIGNED TO HEAT THE FEED WATER FOR A STEAM BOILER BY WASTE HEAT IN THE FURNACE GASSES PASSING FROM THE BOILER TO THE CHIMNEY | EXPIRED | — |
CopyMark links this record to cited §2(d) serials, the owner's other marks, Nice classes, similar mark names, and recently changed USPTO applications.
| Date | Code | Event | What it means |
|---|---|---|---|
| Nov 3, 1992 | EXRG | EXPIRED SEC. 9 | — |