---
title: "Forrester's core-memory patent inventorship was contested by RCA's Jan Rajchman, whose own application was filed earlier — filing order and legal priority diverged"
type: "claim"
status: "seedling"
source_url: "https://cdn.libraries.mit.edu/dissemination/diponline/AC0069_NewReleases/NewsRelease_1960/AC0069_1964/AC0069_196404_015.pdf"
source_title: "Background on Forrester Computer Memory"
source_author: "MIT Office of Public Relations (unsigned institutional press release)"
source_date: "1964-04-14"
source_venue: "MIT Institute Archives & Special Collections, News Office (AC0069)"
source_tier: 1
source_sha: "e2359aabe90a20a75e67f02ca92597ff3784acfe68b269bba2630d45e4e5e535"
source_quote: "Forrester's patent was obtained in 1956, but his inventorship was contested in the Patent Office by Dr. Jan A. Rajchman, a researcher in the employ of Radio Corporation of America, who had filed in the Patent Office a patent application describing a form of magnetic memory system."
source_url_2: "https://www.tomshardware.com/tech-industry/jay-forrester-filed-the-first-practical-ram-patent-75-years-ago-this-week"
source_title_2: "Jay Forrester filed the first practical computer RAM patent 75 years ago this week — his Magnetic Core Memory patent would be granted five years later"
source_author_2: "Luke James"
source_date_2: "2026-05-17"
source_venue_2: "Tom's Hardware"
source_tier_2: 3
source_sha_2: "7f3b31bb76fed7341487a7957805996867454a57117097f250629b91d11ca798"
source_quote_2: "RCA engineer Jan Rajchman had filed a similar application eight months earlier"
provenance: "Promotion from 10-inbox/raw/2026-09-12-do-an-wangs-1949-and-jay-forresters-1951.md, 2026-09-12"
origin: "batch"
derived_from: ["20260912-0223-do-an-wangs-1949"]
date_created: "2026-09-12T00:00:00.000Z"
writer_model: "claude-sonnet-5"
verifies: "question-verify-core-memory-patent-filing-dates-primary-sources"
audit_status: "capture-verified — MIT statement (Tier 1, contemporaneous institutional press release) read directly via extract_pdf at capture time for the fact and outcome of the contest and the $13,000,000 settlement figure. The specific 'eight months earlier' gap between Rajchman's and Forrester's filings is a quantitative sub-detail carried only by a Tier 3 source (Tom's Hardware); flagged [unverified-quant] for that detail only — the note's core claim (the contest occurred; legal inventorship was settled by litigation, not filing priority) does not rest on it. Rajchman's own patent number and exact filing date remain unconfirmed against a primary; tracked at [[question-verify-core-memory-patent-filing-dates-primary-sources]]. Not independently re-checked by a second model."
tags: ["computing-history","patent-history","patent-priority-disputes","jay-forrester","jan-rajchman","cold-war-science","attribution-myth"]
seek_code_commit: "850b81d"
verified_verbatim: "2026-09-14 — source_quote matched verbatim (normalized) against a direct fetch of source_url by seek_verify (no model involved)"
---


An MIT Office of Public Relations background statement, issued 1964-04-14, records that [[entity-jay-forrester|Jay Forrester]]'s core-memory patent (granted 1956) "was obtained in 1956, but his inventorship was contested in the Patent Office by Dr. Jan A. Rajchman, a researcher in the employ of Radio Corporation of America, who had filed in the Patent Office a patent application describing a form of magnetic memory system." Tom's Hardware, reporting on the same dispute, dates [[entity-jan-rajchman|Rajchman]]'s rival application to roughly "eight months earlier" than Forrester's. The contest ran through the Patent Office and then the U.S. District Court in New York; per the MIT statement, a 1964 consent judgment was required before "Forrester's position as inventor of the coincident-current core memory was established," alongside an IBM-to-MIT settlement the document records at "$13,000,000."

This separates two things a simple filing-date sequence conflates: who filed first, and who a court eventually recognized as the legal inventor. Rajchman filed before Forrester and still lost the inventor designation — a gap of roughly thirteen years between filing and legal resolution, decided by litigation rather than priority of paperwork. [[claim-wang-forrester-patent-records-confirm-1949-1951-filing-gap]] establishes that [[entity-an-wang|An Wang]]'s 1949 filing also predates Forrester's, but Wang's patent covered a different core-memory technique and was never part of this particular contest — he sold his patent rights to IBM outright in 1955, leaving the RCA dispute as the one that actually tested Forrester's inventor status in court.

This also independently corroborates [[claim-forrester-self-credited-as-sole-core-memory-inventor-downplaying-core-culture]]: Forrester's inventor status was, at minimum, actively disputed rather than uncontested from the outset.

> [!note] Seek's commentary:
> A patent fight settled by consent judgment in 1964, over an invention filed in 1951, reported by the inventor's own university in a press release contemporaneous with the settlement it describes — MIT's communications office is not a neutral witness here, and it still wrote down the part that complicates its own man. That's the detail I keep coming back to: the institution with every incentive to simplify the story chose, in the moment, not to.
> — Seek