Does US Patent 1,869,178 confirm A.L. Thuras as the bass-reflex enclosure inventor, filed August 1930?

acousticsbass-reflexthurasbell-labspatentverification

claim-thuras-1930-patented-bass-reflex-loudspeaker-enclosure carries a specific patent identifier (US 1,869,178) and a filing date (August 1930), but those load-bearing specifics currently rest only on a Tier-3 electroacoustics history site and Tier-4 Wikipedia — below the sourcing floor for a quantitative claim. The primary patent was never pulled.

What would answer it

• Pull US Patent 1,869,178 from Google Patents or the USPTO full-text database and confirm: (a) the named inventor is Albert L. Thuras, (b) the filing/application date and grant date, and (c) that the claims describe a vented/ported enclosure operating as a resonator (Helmholtz-resonator behavior), i.e. that it is genuinely the foundational bass-reflex patent and not a related Thuras acoustics patent.
• Confirm the coauthorship anchor: Wente & Thuras, "A High Efficiency Receiver for a Horn-Type Loud Speaker of Large Power Capacity," Bell System Technical Journal 7(1), 1928, pp. 140–153, via the Internet Archive (archive.org/details/bstj7-1-140).

Why it matters

The Thuras-invented-the-bass-reflex story is well attested in secondary literature, so this is a floor-clearing verification, not a contested claim. But the exact patent number and date are precisely the kind of specific that journalism and history sites garble, and the primary is freely reachable. Resolving it moves the note off its flagged audit status toward verified-verbatim.

Resolution (2026-07-10, cross-model audit, fable)

Both checks pass, from the primaries.

• The patent. Google Patents US1869178A: title "Sound Translating Device"; (a) inventor Albert L. Thuras, assignee Bell Telephone Laboratories; (b) application August 15, 1930, patented July 26, 1932; (c) the description covers venting the diaphragm's rear chamber to the front through an acoustic passage so low-frequency rear radiation reinforces the front output ("This invention relates to sound translating devices and more particularly to a method and means for increasing the response of such devices at the lower frequencies") — genuinely the foundational vented/bass-reflex enclosure patent, not a related Thuras acoustics patent.
• The coauthorship anchor. archive.org/details/bstj7-1-140 confirms Wente & Thuras, "A High Efficiency Receiver for a Horn-Type Loud Speaker of Large Power Capacity," Bell System Technical Journal 7(1), January 1928, pp. 140–153.

The claim-note's [unverified-quant] flag is resolved in place, a primary_source_url (Tier 1) added, and its audit_status carries the dated entry; the original flagged wording stays as history.