The president hosted Xi and his wife at his Mar-a-Lago estate in early April.
New trademarks gave the company monopoly rights to sell Ivanka brand jewellery, bags and spa services in the world's second-largest economy.
Sales hit record levels in 2017, despite boycotts and several stores limiting her merchandise.
"The brand has filed, updated, and rigorously protected its global trademarks over the past several years in the normal course of business, especially in regions where trademark infringement is rampant", Abigail Klem, president of the brand, said in a statement. Online commerce tracker Slice Intelligence, for example, reported last month that US sales of Ivanka products on Amazon were up 332 percent in January and February compared to a year prior.
Perhaps if Ivanka Trump wasn't the new "modern first daughter", her business-separate from that of the Trump family empire and now in a gray area of White House ethics-would have continued to expand.
The trademarks are the latest sign that Ivanka's brand is thriving under her father's presidency, especially in China, where she's become wildly popular.
Other countries where the company has pending and registered trademarks include Japan, Mexico, Turkey, Israel, Canada and Saudi Arabia.
In a statement Tuesday, a spokesperson for the Ivanka Trump brand said that all 2017 Chinese filings were done defensively to prevent counterfeiters or squatters from using her name.
"Put the business on hold and stop trying to get trademarks while you're in government", Richard Painter, the chief White House ethics lawyer under George W. Bush, remarked to the AP.
When Ivanka Trump gained her office in the West Wing, in theory, she was supposed to step back from her business.
Ivanka's business remains in a trust, but the first daughter must stay away from banking, trade and tax code matters. The Trumps aren't actually the business experts they play on TV, but it's clear they understand that, more often than not, there really is no such thing as bad press. The bounce appears somewhat sustained.
"She has the ultimate showcase to fashion and show her merchandise, whether it's at the [Republican National] Convention. the White House". March sales on Lyst were up 262 percent over the same period past year. "All that buzz is hardwired into her products". That, he added, is a competitive advantage other brands just can't match - though it does come with risk.
Ivanka Trump's company says the new trademarks are part of the normal course of doing business.
Bale said a bigger majority would give May a new batch of loyal Conservative lawmakers and leave her less at the mercy of euroskeptics in her party "who otherwise could have made negotiations much more hard". The biggest joke is how is how it has continued to run outside interests like hotels and a clothing label (I'm looking at you, Ivanka!) while also fake-running the country.