check this patent sir....https://www.google.com/patents/US6776373

While not a capsule and not research, Cirrus builds a one time use parachute called CAPS into the airframe.

Dear Mohsen,

Looking at the number of occurence this kind of solution would have been actually profitable in the last decade, I sincerely doubt there would be any business case here, statistically speaking.

Moreover, this system would have such a dramatic impact on performance and bring critical discussions in terms of aircraft certification.

You can find patents on seats with airbags (mostly for business class...) which could be helping for take-off and landing crashes.

Best Regards

PS : some small aircraft have been recently equipped with parachutes.

Makes statistically and economically no sense. Check the fatal accidents in the recent past first and analyze the rootcause of the accident. Than ask yourself:

Could the system in mind really have have saved lifes? How should have worked in that accident case? How could have this system come around the reason the aircraft drove to a fatal accident?

I have my doubts, theat the multiple reasons, that caused fatal accidents in the past, would fit with your idea. It might be possible to separate a full fighter cockpit with 2 pilotes as a small unit or save a small plane in a stall condition with a parachute.

But how to deal with the full fuselage of a A320 or B737 just to look only for the smaller aircrafts, not to discuss the case of A380.

Instead of working on such a "global approach" it makes more sense to see how accidents can be avoided or in case of, measures to develop, that the probability to survive an accident rises.

So before you continue to play with your phantasy, check first the accident reports of the major Transport and Safety Authorities. E.g. for North America check NTSB USA - https://www.ntsb.gov/_layouts/ntsb.aviation/index.aspx -  and TSB Canada -http://www.tsb.gc.ca/eng/rapports-reports/aviation/index.asp . All their accident investigations are made public and can be found in the internet - that is really first hand information. Also the french BEA is a source with very global information as BEA is mostly with if Airbus-produced aircrafts are involved involved (https://www.bea.aero/no_cache/en/investigation-reports/accessing-reports/)