Doors, Security, and Public-Building Tools in Black Patent Memory

A noindex Sprint 8 cluster for door-holding devices, friction-heater source review, and the public-building myths that need source discipline.

Cluster thesis

Doors, security, and public buildings

Doorway, security, heating, and public-building records can become civic-infrastructure memory, but only when patent titles, identity evidence, and technical limits are not flattened into folklore.

Related patent holders

Osbourn Dorsey / 210764 Charles S. L. Baker / exact patent records needed

Patent records

Source-led record cards

These cards show patent-record facts and review status without promoting final holder rank.

identity_reviewSprint priority 2Not public rankutility patentunder review

210764: Improvement in Door-Holding Devices

Osbourn Dorsey / 1878-12-10

Sprint 8 myth-resistance record. Use the patent title, door-holding device, not a broad doorknob claim.

Residence: Washington, District of Columbia
Category: doors / public-building safety
Source status: under review
Chronology handling: identity_review
Cluster: Doors, security, and public buildings
Myth-resistance note: Do not say Dorsey invented the doorknob. The source-supported title is Improvement in Door-Holding Devices.
Primary sources: 1 mapped

source_reviewSprint priority 8Not public rankutility patentunder review

BAKER-FRICTION-HEATER-REVIEW: Friction-Heater Patent Family

Charles S. L. Baker / 1900-01-01

Sprint 8 source-review placeholder. Exact friction-heater patent rows are required before promotion.

Residence: source review pending
Category: heating apparatus / source review
Source status: under review
Chronology handling: source_review
Cluster: Doors, security, and public buildings
Myth-resistance note: Do not promote friction-heater folklore without primary patent rows.
Primary sources: 1 mapped

Proof limits

What this cluster can and cannot prove.

What these records can prove

Dorsey's patent row supports a door-holding device, not a doorknob-invention headline.
Baker's route marks a friction-heater source-review lane requiring exact patent records.
A myth-resistance pathway for public-building and access-tool claims.

What remains under review

Public identity evidence for Dorsey.
Exact Baker friction-heater patent-family reconciliation.
Technical comparison between door holders, knobs, latches, locks, stops, heaters, and public-building use.

Co-inventor and assignee notes

Do not say Dorsey invented the doorknob.
Do not promote Baker friction-heater claims until exact patent rows are attached.

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