This invention relates to a method for rapidly determining weight and volume percent true boiling point curves for crude oils and fractions thereof. The method involves at least a partial separation of the crude oil or fraction into constituent chemical components, obtaining mass spectra...http://www.google.co.uk/patents/US5808180?utm_source=gb-gplus-sharePatent US5808180 - Direct method for determination of true boiling point distillation profiles of crude oils by gas chromatography/mass spectrometry 
