|FamilySearch.org: 1850 Federal Census, Illinois, Will County, Lockport, p. 30, lines 28-34|
Patrick also appears in the Illinois Land Tract Sales database as purchasing a parcel of land in the village limits of Lockport in 1848. The parcel is only steps from the Illinois & Michigan canal, so my speculation is that he came from Ireland to work on the canal like so many others. These are the only records I've discovered in which Patrick appears.
Patrick, born about 1815 in Ireland, dies possibly before 1860
Mary, born about 1820 in Ireland, appears in Lockport 1860 and 1870
Mary A(nn), born 1843 in Canada, died 1922 in Lockport
married John Patrick Riley
Andrew, born 1845 in Illinois, died 1910 in Lockport
married Rose Anna Stanners
John, born 1849 in Illinois, died 1920 in Lockport
married Isabella Daly
Patrick, born 1850 in Illinois, died unknown
There is likely a relationship to Charles and Elizabeth Clifford, who appear with members of the McWeeney family on several census records.
Other spellings of this name are:
If you are familiar with this surname in Illinois or in Ireland, leave me a message.