The phrase "hitherto efforts" is correct and usable in written English.
You can use it to describe efforts that have been made up until a certain point. For example, "The city council has made hitherto efforts to reduce air pollution in the area."
This review intends to summarize and critically evaluate the hitherto efforts in the production and applications of CNT nanocomposites/hybrid materials as key constructional civil and military elements, preferably as coatings, layers, films, textiles or panels, towards attenuation of the radio wave radiation.
Hitherto efforts to study punctuated molecular evolution have focused mainly on microorganisms [ 22], but our results exhibit punctuated evolution for RKD Wmax) and RM Z Wmax in human NA H1N1, as initiated by migration (interspecies or geographical intraspecies) and vaccination pressures.
The hitherto metallurgical efforts to improve tungsten toughness seem to be still less matured.
Hitherto, extraordinary efforts have been devoted to determining the molecular and pathophysiological characteristics of the diseased heart, aiming to develop novel diagnostic and therapeutic strategies to combat cardiac diseases.
A small force of NATO troops swooped into Celebici by helicopter one day earlier this year, eager to silence critics who complained of a hitherto timid effort to get their man.
Its hostility to reform had hitherto frustrated management efforts to cut labour costs.
The Bush administration has hitherto fought off efforts by a growing bipartisan group in Congress to pass legislation to soften the trade embargo against Cuba.
Hitherto, most research efforts have been focused on elucidating the molecular basis of inherited resistance.
The developed model can help to reduce the experimental effort hitherto necessary to develop novel reactor packings.
Thompson's revolutionary ideas inspired and permeated an effort, hitherto considered hopeless, to determine all the finite simple groups.
He attributes the overruns and delays on giant highway projects that so annoy commuters to Mr Allen's (hitherto much-praised) effort to shrink the state's government.
