 This latter way of drawing the distinction is an important part of John Searle's influential theory of speech acts.Although Grice is best known for his theory of conversational implicature, he also introduced the notion of conventional implicature.The difference between the two lies in the fact that what a speaker conventionally implicates by uttering a sentence is tied in some way to the timeless meaning of part of the sentence, whereas what a speaker conversationally implicates is not directly connected with timeless meaning.