Upon maturity, I sent a routine notification to his forwarding address but got no reply.

在时机成熟时，我发出了一个例行通知他的转发地址，但没有得到任何答复。

youdao

We further confirm that the Bank Guarantee is cash-backed and is divisible, assignable, transferable, irrevocable and unconditionally callable upon maturity.

我们在此进一步确认本保函是现金支撑的，可分割的、让渡的、可转让的、不可撤销的及到期无条件保付的。

youdao

The above No. 5 sum of money was original 1-year fixed deposit (RMB XXX) saved on March 4, 2009, and the money was re-deposited to the present deposit upon maturity.

上述第5笔存款原为2009年03月04日存入的一年期定期存款(XXX元)，该存款于到期日转存为现在的存款。

youdao

Training doctrine and training practices often give police officers guidelines about how they respond to a wide variety of incidents, and we also depend upon their maturity and common sense to resolve situations in the best way possible.

NPR: Black And Blue: Police And Minorities