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Patent holder profile

Philip B. Downing and the street-rail switch record

Downing's street-railway switch record belongs in civic systems memory, while the letter-box claim stays separated until its exact patent row is reconciled.

Why this belongs on CultureUp

Downing is a public-record memory story.

This belongs on CultureUp because the patent record connects invention to place, public institutions, work systems, laboratories, employers, federal or corporate assignment, and the limits of public records.

Sprint 8 priority 5 / not final rankStatus: source_reviewedSource grade: B+

Patent: 430118: Street-Railway Switch
Issue date: 1890-06-17
Place: Boston, Massachusetts
Record strength: Patent-record facts are attached with at least one public context source. CultureUp still separates patent proof from biography, adoption, commercialization, and identity claims.
Identity evidence: Public context source attached where available; CultureUp does not use the patent row alone as race, ancestry, lineage, or Indigenous Black identity proof.
Sprint priority: 5 / not final rank
Cluster: Street rail, mail, and civic systems
Myth-resistance note: Do not say Downing invented the mailbox unless the exact letter-box patent row and source limits are attached. This profile promotes the street-rail switch record.
Needed before promotion: Promotion language should remain limited until source-led context, assignment, co-inventor, and commercialization review is complete.
Why this record matters: The street-railway switch gives CultureUp a civic-systems patent anchor. The popular mailbox claim remains a separate source-review item until the exact letter-box row is attached.

What the public record supports

U.S. Patent No. 430118, issued June 17, 1890.
Boston, Massachusetts, as recorded place.
Street-railway switch technology as transit and civic infrastructure.

What remains open

Exact letter-box patent row before mailbox language is used.
Public biography and identity-source trail beyond the patent row.
Transit adoption or municipal-use context.

Article profile

Read the person, place, invention, and record separately.

CultureUp keeps each layer visible so a patent record does not get stretched into claims the source trail cannot support.

The patent record

430118 was issued on 1890-06-17 for Street-Railway Switch.

The person in the record

The attached public context sources support a reader-facing profile frame. Any deeper life history, family record, school record, employment file, or community memory needs its own source trail.

Place attached to the claim

Boston, Massachusetts is the public place anchor used for this route. CultureUp does not infer local family continuity from the patent row alone.

The invention

The invention is summarized from the public patent title and source trail. Technical, market, institutional, and adoption claims stay limited to what the attached sources can support.

Business, labor, and use

Modern patent records often separate inventor, employer, assignee, licensee, and beneficiary. CultureUp keeps those categories apart instead of treating a patent as proof of ownership, wealth, adoption, or public impact.

What the record cannot prove

The patent record does not by itself prove full biography, race, ancestry, Indigenous Black identity, commercialization, institutional adoption, economic benefit, modern product lineage, or community memory.

Identity and correction note

CultureUp treats this as Black American patent memory only through public, reviewable sources. The page does not certify ancestry, descent, tribe, nationality, family history, or private identity.

Send stronger patent images, assignment records, employer records, licensing documents, public biographies, or source corrections through CultureUp's correction path.

Patent records do not prove final rank, private identity, solo credit when co-inventors appear, employment ownership, commercialization, adoption, or later public impact.

Indexable as a source-led Sprint 8 profile with visible source limits.

Employer, assignee, and inventor status are not interchangeable. CultureUp names assignees when the patent record does.

Keep street-rail switch and letter-box claims separate; they are not interchangeable source facts.

Patent records

Grant trail

Grant rank and unique-holder rank are shown separately so repeat patentees do not distort the chronological sequence.

sprint_candidateSprint priority 5Not public rankutility patentmedium high

430118: Street-Railway Switch

Philip B. Downing / 1890-06-17

Sprint 8 civic-systems candidate. This row supports a street-railway switch; the letter-box/mailbox claim remains source review until exact row reconciliation.

Residence: Boston, Massachusetts
Category: street rail / civic systems
Source status: medium high
Chronology handling: sprint_candidate
Cluster: Street rail, mail, and civic systems
Myth-resistance note: Do not say Downing invented the mailbox from this row. Add letter-box language only after the exact patent row is ledgered.
Primary sources: 2 mapped

Source trail

Claims stay tied to source limits.

Street rail, mail, and civic systems

Sources for street-rail switching, mail systems, civic movement, and public infrastructure records.

patent text mirrorpatent text

US430118A - Street-Railway Switch

Google Patents / 1890 patent record

Supports: Shows Philip B. Downing of Boston, Massachusetts, connected to a street-railway switch patent published June 17, 1890.
Limit: This row supports street-railway switch facts, not a letter-box or mailbox claim. Patent records do not by themselves prove full race/identity, biography, commercialization, public memory, economic benefit, or personal ownership.
Last checked: 2026-06-10
Source URL: https://patents.google.com/patent/US430118A/en

Title reconciliation needed

Sources where title wording, instrument names, mailbox/letter-box language, or family patent claims need exact row reconciliation before promotion.

exact patent record neededsource-review queue

Philip B. Downing letter-box exact patent row

CultureUp source review / letter-box claim under review

Supports: Keeps Downing's letter-box/mailbox claim in source review until the exact patent number, title, date, and source limits are ledgered.
Limit: Do not say Downing invented the mailbox unless the exact letter-box patent row is attached and the claim is narrowly framed.
Last checked: 2026-06-10
Source URL: https://www.uspto.gov/patents/search/patent-public-search