A grace period in corporate America’s freeze-out of Huawei might not help the tech company very much. • Last week, the Commerce Department said that U.S. companies would need special permission to sell some products to Huawei and other Chinese companies. • Yesterday, companies including Google, Qualcomm and Broadcom were reported to have frozen their supply of components and software to the Chinese technology giant. • Late yesterday, the Commerce Department said it would grant 90-day permissions for transactions needed to support handsets and equipment Huawei had already sold. The reprieve “doesn’t mean much,” Ren Zhengfei, Huawei’s founder, said.