How a $500K Patent Built a $3B Empire — And Why It Collapsed

The $500,000 Patent That Powered an Industry

On May 17, 1955, the USPTO granted patent US 2,708,722 for a "Pulse Transfer Controlling Device" — a magnetic core memory read-after-write mechanism that solved the destructive-read problem. The inventor, 35-year-old An Wang, sold the patent to IBM for $500,000. That invention became the foundation of mainframe memory for the next 25 years.

From Shanghai to Route 128

Born in 1920 in Shanghai, Wang graduated from Shanghai Jiao Tong University, earned a PhD in applied physics from Harvard in three years, and worked with Howard Aiken on the Mark IV. After Harvard cut hardware funding, Wang and colleague Ge-Yao Chu founded Wang Laboratories in Boston.

Calculators, Word Processors, and a $3 Billion Peak

Wang avoided competing with IBM mainframes, instead building transistorized desktop calculators. Sales passed $1 million in 1964; the 1967 IPO saw shares jump from $12.5 to $40.5. The breakthrough came in 1976 with the Wang WPS (Word Processing System): a CRT green screen, floppy drive, and dedicated editing keyboard that let secretaries edit on screen before printing. By the early 1980s, revenue hit $3 billion, employees exceeded 33,000, and Wang's personal wealth reached $2 billion.

Wang System 2200 computer, 1970s Wang hardware/software cornerstone. Photo: Unknown, CC BY-SA 3.0, via Wikimedia Commons

The Dual-Class Trap and Debt-Fueled Growth

To retain family control while accessing public capital, Wang created a dual-class structure: Class B shares (public) had 1/10 the voting power of Class C shares (family). The NYSE objected and delisted the company; Wang moved to the AMEX. When the 1980s demanded billions for new product lines, Wang refused to issue equity and instead borrowed heavily via high-yield bonds. This leverage worked in good times but left zero cushion when the market shifted.

Dr. An Wang, 1979, Massachusetts. Photo: Unknown, CC BY-SA 4.0, via Wikimedia Commons

The 1983 "Vaporware" Launch and Succession Crisis

On October 4, 1983, Wang's son Fred Wang, 33, unveiled 14 products at once — from supermicros to LANs. Datamation mocked: "Wang announced everything but the kitchen sink." Most products were vaporware, severely damaging credibility. In 1985, longtime COO John Cunningham resigned rather than accept Fred's succession. In 1986, Wang installed Fred as president despite board opposition, triggering an exodus of senior R&D and sales leaders.

"Wang announced everything but the kitchen sink. If the sink could connect to a personal computer, they would have announced that too."

Not Killed by the PC — But by Incompatibility

Contrary to the myth that Wang ignored the PC, the company launched the Wang PC in April 1982 with a true 16-bit Intel 8086, faster than the IBM PC's 8088. However, Wang deliberately made it hardware-incompatible with the IBM PC, expecting software vendors to port to his platform. They didn't. The Lotus 1-2-3, WordStar, and dBASE ecosystem existed only on IBM-compatible machines. A startup, MultiMate, cloned Wang's word-processing interface on the IBM PC, letting customers get the same experience on cheaper hardware — slicing away Wang's last moat.

Debt Crisis, Death, and Bankruptcy

By 1989, VS minicomputer sales collapsed under pressure from DEC, HP, IBM, and Sun Unix servers. Interest on nearly $1 billion in debt became unsustainable. Creditors demanded Fred's removal. From his hospital bed with terminal esophageal cancer, Wang asked his son to resign. Turnaround expert Richard Miller took over but found a balance sheet crushed by debt, no cash for R&D, and no equity capacity for acquisitions. Wang died March 24, 1990. Wang Laboratories filed Chapter 11 on August 18, 1992; its headquarters were sold off.

Magnetic core memory close-up. Wang's patent laid the physical foundation for early computer memory. Photo: Oliver Kurmis, CC BY-SA 3.0, via Wikimedia Commons

Wang sold the invention that powered the computing industry for $500,000; he built a $3 billion castle on borrowed bricks; when the storm came, the castle crumbled — but the foundation he sold still lies beneath every silicon chip made today.