Do An Wang's 1949 and Jay Forrester's 1951 core-memory patent filing dates hold up against the patents themselves or a peer-reviewed history?

computing-historypatent-historyjay-forresteran-wangcold-war-scienceattribution-mythquote-verification

This capture follows up question-verify-core-memory-patent-filing-dates-primary-sources, which flagged claim-an-wang-1949-patent-filing-predates-forresters-1951-core-memory-patent as resting on a single Tier 3 Computer History Museum web page for a specific sequence of patent-filing years. Both named patents were located and read directly via patents.google.com (this vault's established reachable mirror for reproduced USPTO grant text, per sources.md's known-blocked-routes notes — direct USPTO endpoints 403/404 without an authenticated session).

Claim: An Wang's core-memory patent record confirms a 1949 filing date

verifies: question-verify-core-memory-patent-filing-dates-primary-sources

An Wang's patent "Pulse transfer controlling device" (US2708722A, application US122769A) carries a filing (and priority) date of 1949-10-21 in the patent record itself: "Filing date1949-10-21Publication date1955-05-17." The patent issued 1955-05-17 and is listed as expired-lifetime (anticipated expiration 1972-05-17, the standard 17-year term from grant). This is a quantitative (date) claim resting on the primary document itself — Tier 1 — not on the museum web page the earlier claim-note flagged.

Claim: Jay Forrester's core-memory patent record confirms a 1951 filing date

verifies: question-verify-core-memory-patent-filing-dates-primary-sources

Jay Forrester's patent "Multicoordinate digital information storage device" (US2736880A, application US225714A, assigned to Research Corp) carries a filing date of 1951-05-11: "Filing date1951-05-11Publication date1956-02-28." The patent issued 1956-02-28. Tier 1, read directly from the primary document.

Claim: The Wang-precedes-Forrester filing sequence holds up against the patents themselves

verifies: question-verify-core-memory-patent-filing-dates-primary-sources

Reading both patents directly confirms the specific two-year gap the flagged claim-note had sourced only to an unsigned Computer History Museum page: Wang's application was filed 1949-10-21 and Forrester's 1951-05-11 — a gap of roughly 19 months, consistent with the museum page's "1949" vs. "1951" framing. On this narrow, load-bearing question — do the two headline filing dates themselves check out against the patent record — the answer is yes. This resolves the [unverified-quant] flag on claim-an-wang-1949-patent-filing-predates-forresters-1951-core-memory-patent for the Wang/Forrester pair specifically (the Viehe-1947 and Rajchman-1950 legs of that same four-name sequence were not independently re-verified against their own patent records this session — see Further leads).

Claim: Filing-date order is not the same thing as legally recognized priority of invention

An MIT Office of Public Relations background statement, issued 1964-04-14 (contemporaneous with the settlement it describes), records that Forrester's patent — though granted in 1956 — had its inventorship "contested in the Patent Office by Dr. Jan A. Rajchman," an RCA researcher whose own core-memory patent application predated Forrester's: Tom's Hardware, drawing on the same dispute, describes Rajchman as having "filed a similar application eight months earlier." 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 needed before "Forrester's position as inventor of the coincident-current core memory was established," accompanied by an IBM-to-MIT settlement the document puts at "$13, 000, 000" (a round $13 million). This complicates a purely date-sequence reading of "who invented core memory first": Forrester's filing date (1951) trails Rajchman's, yet Forrester — not Rajchman — ended up as the legally recognized inventor of record for the coincident-current system, by litigation outcome rather than filing priority alone. Wang's 1949 patent, by contrast, covered a different core-memory technique and was not part of this particular contest; Wang sold his patent rights to IBM in 1955 outright.

Further leads

• Frederick Viehe's 1947 patent (reported elsewhere as US2970291, "Electronic relay circuit") — not read directly against patents.google.com this session; would complete the four-patent verification set.
• Jan Rajchman's own core-memory patent (RCA, reported filed 1950) — not read directly against patents.google.com this session; his exact filing date and patent number remain unconfirmed against a primary.
• Emerson Pugh, "Ferrite core memories that shaped an industry," IEEE Transactions on Magnetics, Vol. 20 No. 5 (September 1984), pp. 1499–1502 — the peer-reviewed history named in the governing question; IEEE Xplore blocked extract_pdf (returned non-PDF content) this session, so it remains unread. Pugh's related book, Memories That Shaped an Industry (MIT Press, 1984), is the same author's fuller treatment and equally unread.
• An Wang's own autobiography, Lessons: An Autobiography (Wang Institute of Graduate Studies, 1986), cited secondhand in the MIT "Core Report" course paper as recording Wang's first-person account of the 1948 Harvard demonstration and his regret at not pursuing it further — his own words, unread directly.
• claim-forrester-self-credited-as-sole-core-memory-inventor-downplaying-core-culture — the separate, still-Tier-3 characterization of Forrester's public self-narrative; this capture's Claim 4 (the Rajchman contest) is independent corroboration that Forrester's inventor status was, at minimum, actively disputed rather than uncontested from the outset.

Entity candidates

• Jan Rajchman — person — RCA researcher whose own core-memory patent application predated Forrester's and was the direct rival the Patent Office and federal court had to adjudicate against before Forrester's inventor status became official; the foundational earlier-filing figure this whole priority question turns on, currently unrepresented in the vault beyond a bare mention.
• Frederick Viehe — person — amateur inventor (Los Angeles street/sidewalk inspector) reported as the earliest of the four core-memory filers (1947), predating even Wang; unread primary, unrepresented in the vault.
• Emerson Pugh — person — IEEE Transactions on Magnetics (1984) author and MIT Press historian of ferrite core memory; the peer-reviewed source named directly in the governing question and still unread this session.
• An Wang — person — already flagged in the prior capture; his own patent record is now directly confirmed (this capture), strengthening rather than changing his existing vault status.
• Jay Forrester — person — already hub-status in the vault; this capture adds a second, independently sourced complication (the Rajchman patent contest) to his core-memory origin story beyond the self-credit characterization already on file.
• Research Corporation — concept/term — the nonprofit patent-management intermediary that held Forrester's patent on MIT's behalf and was itself a party to the RCA litigation; relevant to how mid-century university inventions were commercialized, unexplored in the vault.