IBM patent: Pay at the table system

有一个来自IBM的古怪专利，Pay at the table system获得了美国专利局的批准。

Patrons at a restaurant or bar can pay at their table using credit cards, without involving the restaurant or bar cashier and/or wait staff. Patrons are assisted using this system in dividing the bill by displaying the amount due (including tax) and allowing each patron to enter the amount they wish to pay. When the initial bill is presented, a balance due will be displayed and the indication will be provided that the bill has yet to be paid in full. As each transaction is entered, a running total will be displayed indicating the remaining balance due. When the running total reaches zero, the bill is paid in full, and an indication will be provided, such as by illuminating a green indicator light or by displaying a balance due of $0.00.

可是，这样一来，the mighty Bistromathematical 威力岂不是大减。