Frank R. Oliveri, 76, an inventor at the U.S. Patent Office whose inventions saved the government more than a quarter of a million dollars, died Friday at Holy Cross Hospital following a heart attack.

He joined the Patent Office in 1920, worked in the document services branch and rose to become head of the assignments division. The Patent Office is part of the Department of Commerce.

At his retirement in 1965, Patent Office officials noted that Mr. Oliveri had saved the government more than $250.000 through his invention.

They credited him with earning a record number of Commerce Department awards for his automatic paper cutter, his special book cradle for microfilming, and for several modifications that allowed books of several sizes to be copied without camera adjustment.

Mr. Oliveri's inventions speeded up the production of copies of patents, making the process easier for thousands of inventors, lawyers and the plain curious.

His work brought him cash awards totaling $1,500. But as an employe of the Patent Office, he was ineligible to apply for patents on any of his ideas until a year after leaving the office. he never took advantage of this after his retirement, his family said.

Mr. Oliveri was born in Italy and came to this country with his parents in 1903. He was educated in public schools in Washington. He lived in Rockville.

He is survived by three brothers, Dr. Michael E. of Washington, Anthony (Andy), of Silver Spring, and Joseph W., of Cape Coral, Fla.