Patent record
US4677552
International commodity trade exchange
| Assignee | — |
|---|---|
| Filed | 1984-10-05 |
| Granted | 1987-06-30 |
| Status | expired term |
| Est. term end | 2004-10-05 |
| Fee lapse date | — |
| CPC codes | G06Q40/04 |
Dates here are estimates from patent-term math (20 years from filing, or the older 17-from-grant/20-from-filing rule for pre-1995 filings), not a legal determination. They ignore patent-term adjustments, extensions, and terminal disclaimers, and don't reflect maintenance-fee lapses that haven't happened yet. This is not legal advice.