"previously invented" is correct and usable in written English.
It is typically used to indicate that something was invented at an earlier time. For example, "The printing press was a previously invented technology used to mass print books."
Hedvig was founded by Avinash Lakshman, who previously invented Cassandra at Facebook and co-invented Amazon's Dynamo NoSQL database.
But this often does not work with water from factories, especially as it may contain synthetic compounds that are toxic and not biodegradable.Dr Zhang had previously invented a method to clean groundwater and contaminated soil using iron nanoparticles.
This theory helps derive the previously invented building blocks, which consist of only two inter-connected angulated elements, for planar foldable structures.
Townes had previously invented the maser, a device that emits coherent beams of microwaves (for which he later won the Nobel Prize).
Related PC was previously invented by recycling coal ash (fly ash) and the waste glass bottle of soft drinks at 950 1150 °C (Nishida 2009, 2010; Tamaki et al. 2006).
Karpas, previously invented manufacturing processes for Turner Award-winning artist Anish Kapoor and developed new ways to print medical grade silicone as the founder of the medical device company, Metamason.
Take metal, for instance, a genre I had previously assumed was invented for the sole purpose of giving me a headache.
It's the first time these 11 musicians have performed together, and most of them have never previously played these invented instruments that are embedded in seven structures, in a cross between a music performance and an art installation described as a "musical shantytown".
Sunstein points to the fact that Woolston himself examined dozens of examples of "prior art," as it is known in the business, on a single patent in order to be able to distinguish his own work from anything that had been invented previously.
The discovery suggests that the invention of lethal projectile weapons came far earlier in the course of human prehistory than previously realised and that, once invented, the knowledge was passed down the generations, according to a study in Nature led by Curtis Marean of Arizona State University.
For example, he previously called it a "hoax" invented by China to make U.S. manufacturing less competitive.
