USPTO serial 71683308
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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 |
|---|---|---|---|
| 026 | INDICATORS AND CONTROLLERS FOR MEASURING THE ELECTRIC CONDUCTIVITY OF LIQUIDS PASSING THROUGH ION EXCHANGE UNITS, SAID CONTROLLERS CONTROLLING THE VALVE MECHANISMS OF SAID ION EXCHANGE UNITS | EXPIRED | Feb 28, 1955 |
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 |
|---|---|---|---|
| Oct 14, 1996 | EXRG | EXPIRED SEC. 9 | — |
| Jan 10, 1976 | REN1 | REGISTERED AND RENEWED (FIRST RENEWAL - 20 YRS) | — |