Patent · 1920 · age 64

US Patent 1329559: Valvular conduit

Kept from patents.google.com · 2 files · 1.2 MBCall number TES PT1920.01

Provenance

Source: patents.google.comalso patentimages.storage.googleapis.com
Retrieved: 1 October 2026
Source terms (summary): Google terms: automated access against robots.txt counts as abuse
Rights: Public domainPatent text by Tesla, who died in 1943.Basis: author death year 1943, under a life-plus-70-years rule, as of 2026; other rules, such as the United States publication-date rules, are not assessed.
Formats: HTML, PDF scan
Fingerprint: 69c2e308886f46716ef24bbc90a338df759f06045a38e72be6d9ec2006420362sha256 of the file (64 characters). Any change to the file changes this code.
Cite as: Nikola Tesla, US Patent 1329559: Valvular conduit (1920). Long Keeping, call number TES PT1920.01. https://longkeeping.com/nikola-tesla/us-patent-1329559-valvular-conduit/

Unchanged since collected At the last check, on 2 October 2026, all 903 originals, this work's 2 files among them, matched the fingerprints recorded when they were collected. Each copy is re-checked by hand once a year; there is no automatic alert yet.

Notes on this copy

#1The file carries images, and no check is recorded yet that none of them is a picture of the person (the collection keeps no likenesses).
#2Machine-read text (OCR), not proofread, with no page images in the file to check it against.

Original

googlepatents_US1329559A.html

Open reading copy 422 KB Exact filePublic domain

Reading copy: the saved page with its pictures left out. A picture appears in the reading copy only once the library has recorded its licence, the licence is on the library's pass list, and it has been checked for a likeness. See its pictures at the source (another site). Exact file: the page byte for byte; its pictures do not load here.

Files

First pass, not a clearance.

Links inside these saved pages were written for the site they were saved from; some lead nowhere here.

File	Format	Size	Source	sha256	Label
googlepatents_US1329559A.html exact filemain	HTML	422 KB	patents.google.com	69c2e308886f46716ef24bbc90a338df759f06045a38e72be6d9ec2006420362	Public domainPatent text by Tesla, who died in 1943.Basis: author death year 1943, under a life-plus-70-years rule, as of 2026; other rules, such as the United States publication-date rules, are not assessed.
googlepatents_US1329559A_scan.pdf	PDF scan	748 KB	patentimages.storage.googleapis.com	c169635802df6b7320db350eaf8cc32b89a5ab0897babdff9182eb098299d93b	Public domainPatent text by Tesla, who died in 1943.Basis: author death year 1943, under a life-plus-70-years rule, as of 2026; other rules, such as the United States publication-date rules, are not assessed.Held in the archive: its images await the archive's likeness review. Its source (another site)