---
title: "An Wang filed a magnetic-core memory patent in 1949, two years before Jay Forrester's 1951 filing"
type: "claim"
status: "seedling"
source_url: "https://www.computerhistory.org/storageengine/whirlwind-computer-debuts-core-memory/"
source_title: "1953: Whirlwind computer debuts core memory"
source_author: "Computer History Museum, The Storage Engine"
source_quote: "Amateur inventor Frederick W. Viehe filed a core memory patent in 1947 followed by Harvard physicist An Wang in 1949. RCA's Jan Rajchman and MIT's Jay Forrester filed in 1950 and 1951 respectively."
source_tier: 3
source_sha: "2613d7aec3c57669bfed9b40bd21b5929099f349ca4cbda456d6458699c6f16c"
provenance: "Promotion from 10-inbox/raw/2026-09-11-hop-forrester-core-memory-self-credit-echoes-song-jian.md, 2026-09-11"
origin: "batch"
derived_from: ["20260911-0239-hop-forrester-core-memory-self-credit"]
date_created: "2026-09-11T00:00:00.000Z"
writer_model: "claude-sonnet-5"
audit_status: "flagged ([unverified-quant]) — patent-filing years (1947/1949/1950/1951) are a quantitative claim; sources.md's sourcing floor requires Tier 1–2 for any specific date, and the only source here is a single undated, unsigned Computer History Museum web page (Tier 3), not the patents themselves or a peer-reviewed history. Routed at [[question-verify-core-memory-patent-filing-dates-primary-sources]]. || 2026-09-13 cross-model audit (claude-fable-5): source_quote re-verified verbatim against both the live page and the cached capture (source_sha match). CORRECTED: the body had attributed a 1948 working demonstration at Harvard to this CHM page; the page contains no such statement — the detail appears only in the MIT course paper in this cluster. Body sentence rewritten; original wording preserved here: 'The same source reports Wang also demonstrated a working implementation at Harvard in 1948, a year before Forrester's Whirlwind team adopted the approach, though that detail is recorded here as unquoted context rather than an independently verified fact.' Lead for the open question: the CHM page's own 'Contemporary Documents' section lists Wang, 'Pulse transfer controlling devices,' US 2708722 (Filed: October 1949) and Forrester, 'Multicoordinate digital information storage device,' US 2736880 (Filed: May 1951) — patent numbers directly checkable via the Google Patents mirror per sources.md. The [unverified-quant] flag stands until the patents are read directly."
tags: ["computing-history","patent-history","cold-war-science","jay-forrester","an-wang","attribution-myth","cross-domain-bridge"]
seek_code_commit: "98503b7"
verified_verbatim: "2026-09-12 — source_quote matched verbatim (normalized) against a direct fetch of source_url by seek_verify (no model involved)"
---


Patent-filing records place Harvard physicist [[entity-an-wang|An Wang]] well ahead of [[entity-jay-forrester|Jay Forrester]] in the race to patent magnetic-core computer memory. Per the Computer History Museum: "Amateur inventor Frederick W. Viehe filed a core memory patent in 1947 followed by Harvard physicist An Wang in 1949. RCA's Jan Rajchman and MIT's Jay Forrester filed in 1950 and 1951 respectively." On this sequencing, Forrester was the fourth of four named filers — two years behind Wang and one behind RCA's Rajchman — not the technology's originator, even though this vault's own [[entity-jay-forrester|entity page for Forrester]] has, until now, carried "invented magnetic-core computer memory" as unqualified biography. A 1948 Harvard demonstration by Wang is *not* reported on this CHM page — that detail comes from the cluster's other source, the unreviewed MIT course paper (see [[claim-forrester-self-credited-as-sole-core-memory-inventor-downplaying-core-culture]]), and carries that note's Tier 3 caveats; an earlier wording here misattributed it to "the same source" (corrected 2026-09-13, original preserved in audit_status).

The claim is quantitative — a specific sequence of filing years — and currently rests on a single Tier 3 museum web page rather than the patent filings themselves or a peer-reviewed account (the originating capture names Pugh, *IEEE Transactions on Magnetics*, 1984, as a lead, not read directly). Per the vault's sourcing floor, dates require Tier 1–2 sourcing before this note can leave `seedling`; tracked at [[question-verify-core-memory-patent-filing-dates-primary-sources]]. See also [[claim-forrester-self-credited-as-sole-core-memory-inventor-downplaying-core-culture]] for the self-credit narrative this sequencing complicates.

> [!note] Seek's commentary:
> Four names, in filing order: Viehe, Wang, Rajchman, Forrester. Only the last one kept a symposium circuit going on the strength of being first.
> — Seek