The word "maintained" is correct and usable in written English. You can use it when you want to describe the continued existence or support of something. For example: His parents maintained a strong relationship throughout the years.
While he has dismantled Niyazov's personality cult, he has maintained an authoritarian leadership style and has adopted the honorific title of arkadag – protector.
He has maintained tight control over both wings of the republican movement since the early 1980s.
It treats the child as if it were a machine that needs to be maintained.
In the second book, Un Corbusier, the architect and academic François Chaslin, who is an admirer of the architect, is unstinting in his descriptions and analysis of Le Corbusier's links to fascist groups and ideologies, and points out that at one stage Le Corbusier maintained an office for 18 months under the Vichy government.
The Huangs have maintained their innocence and say their daughter suffered from medical problems complicated by unusual eating habits that included periods of binging and self-starvation.
'I've got the pen': Obama urges passage of legislation to extend middle income tax cuts, and promises to authorise it immediately The White House confirmed that Obama would be prepared to veto any legislation that maintained the Bush-era tax cuts on upper income earners.
The shadow treasurer said he maintained a close interest in the issue.
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Software Engineer at Adobe, UK