SALEM – A Boston painter who admitted he stabbed another man in the chest inside a Lynn bar in 2008 may serve up to seven and a half years in state prison.Eduardo Ramos, 33, last known address of 33 Bacon St., Dorchester, was to go on trial last month in Lawrence Superior Court, but instead pleaded guilty prior to trial to charges of armed assault with intent to murder and assault and battery with a dangerous weapon in connection with the Dec. 28, 2008 stabbing of Ricardo Ramos (no relation) inside Molino’s Bar in Lynn.As part of the plea negotiations, Judge Timothy Q. Feeley agreed to delay sentencing for two weeks.Ramos was sentenced Wednesday afternoon in Salem Superior Court to serve not less than four and a half and not more than seven and a half years in state prison by Feeley.Assistant District Attorney John Brennan argued for a more severe punishment of seven to nine years behind bars, pointing out that the victim was stabbed three times and that it was an “unprovoked attack.”On the night of the incident, 38-year-old Ricardo Ramos of Lynn told authorities, while a customer at Molino’s Bar, located at 937 Western Ave., Lynn, he went to the bathroom. While inside the bathroom Ricardo Ramos mistakenly opened Eduardo Ramos’ bathroom stall door, which apparently angered him.As Ricardo Ramos was exiting the bathroom, Eduardo Ramos pulled out a knife and stabbed him three times in the chest area.Carlos Contreras, 36, of Lynn, a bouncer at the bar, quickly interceded, subduing Eduardo Ramos onto the ground. Several other employees also held down Ramos until police arrived. The knife was recovered by police at the scene.The victim was rushed to Massachusetts General Hospital in Boston for treatment and released after one day.The stabbing incident was captured on the video camera inside the bar.Brennan pointed out during the sentencing hearing that if it was not for the bouncers pulling off Eduardo Ramos, the victim could have been killed and that there really was no motive for the attack.Brennan told Feeley that the victim, who chose not to be present, has major scarring, tingling in his arms and shoulders as a result of the incident.Defense lawyer Mark Schmidt urged the court to be lenient, proposing a jail term with probation, rather than a state prison sentence, saying it was appropriate since his client had no prior violent record.Feeley said he took the facts into account and felt his sentence was the most just.The judge credited Ramos the 177 days he spent in jail in lieu of bail on the case.