Qualcomm is asking a court to force Apple’s iPhone and iPad manufacturers to pay up, since they’ve been withholding royalty payments for weeks under Apple’s instructions.

In a court filing yesterday, Qualcomm asked for a preliminary injunction against four of Apple’s suppliers — Foxconn, Pegatron, Wistron, and Compal — all of which it began suing for breach of contract earlier this month. Qualcomm said in April that Apple had instructed those companies not to pay royalties for devices they made using Qualcomm technology. It later said that would lead to a loss of $500 million in revenue this quarter alone because of the missing payments.

Qualcomm and Apple are locked in a…

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