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USPTO Patent Public Search / image server (2026-10-03)

Site: United States Patent and Trademark Office, Patent Public Search (https://ppubs.uspto.gov/pubwebapp/). Full-page PDFs come from https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/{number}. Result: positive (two family members were missing from the project folder; both downloaded). What was searched: numbers identified on the Internet Archive (1937 Index of Patents): 2,094,602 and 2,096,459. The ppubs text search itself was not used (it runs in JavaScript). I retrieved the patents by number.

Downloads (in `files/`)

files/US2094602.pdf (22 pp.: 10 drawing sheets, 12 text pages) and files/US2094602.ocr.txt (tesseract OCR of pp.11-22 at 200 dpi).
files/US2096459.pdf (18 pp.: 10 drawing sheets, 8 text pages) and files/US2096459.ocr.txt (OCR of pp.11-18).

US 2,094,602: "Apparatus for the generation of short electromagnetic waves"

Ernst Eduard Wilhelm Kassner, London, England. Filed 15 Sep 1934 (Serial 744,119). Priority Germany 31 Aug 1933. Patented 5 Oct 1937. 45 claims. No assignee printed [web: https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/2094602; read on page image p.11].
Subject: a discharge tube containing resonance systems of "metallic spheres, plates or rings", coupled to each other. It is meant to excite oscillations "over the whole of a wide range of frequencies" in the quasi-optical range. The patent says a conducting sphere or circular plate "having, for example, a diameter of 1 cm. or a radius of 2 cm" has natural frequencies "which can be calculated by means of Hankel and Bessel functions" at wavelengths of millimetres to centimetres. The diameter and radius in that sentence do not agree (1 cm diameter means 0.5 cm radius) [web: OCR p.11-12, file line 333-341].
The later embodiments (Figs. 36-37) place the valve at one focus of a metal rotation ellipsoid. A container at the other focus holds "a substance to be treated", with a circulating flow, a thermostat, and a high-frequency "pre-ionization accelerating the process of absorption of the substance to be influenced". There is an exit for "a wave-lengths-measuring device". Claims 40-45 claim this ellipsoid applicator, with temperature control and an optional "electrical treatment" [web: OCR lines 1820-1900, claims 40-45].
The patent gives no frequency, power, efficiency, substance, result or measurement. A grep of the OCR for cm, mm, watt, volt, medical, biological, therapy, vulcanisation, food and chemical finds only the sphere-size sentence above [calc: grep of OCR].
Family: same convention date and filing date as GB448417, GB448418 and GB448419. Its subject matches the title of GB 448,418 ("Electric discharge devices and circuits for the generation of short electromagnetic waves and radiating arrangements therefor") and of FR 786,296 ("Tube électronique, oscillatrice à boules ...") (see 2026-10-03-internet-archive.md). That US 2,094,602 is the US twin of GB448418 is an inference from title, dates and subject, not stated in the patent.

US 2,096,459: "Ultra short wave oscillation generator"

Kassner, London. Filed 15 Sep 1934 (Serial 744,160). Priority Germany 31 Aug 1933. Patented 19 Oct 1937 [web: https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/2096459; read on page image p.11].
Subject: multiple-system valves with "wave conductors". It carries the same tuning tables as GB448419: 0.33-1.1 m produced "without a gap", 2.45-4.5 m, and Table 4 (push-pull), stated with "a degree of efficiency of about 40%" [web: OCR lines 1208-1229, 1440-1450]. So it is the US twin of GB448419. The "about 40 %" figure therefore appears in both the GB and US texts, again with no measurement method.
One sentence bears on claim 1: the generator yields "a series of juxtaposed frequencies ... a frequency band of definite width which proves to be advantageous in many cases, for instance for excitation of molecular unions, and dipole liquids within the region of anomalous dispersion bands" [web: OCR lines 1110-1118]. This is a qualitative statement only, with no data.

How this bears on the claims

Claim 5 (apparatus, "about 40 %"): the efficiency figure is repeated in the US twin, still unmeasured. No change.
Claim 4 (resonators): US 2,094,602 adds sphere and ring resonators "calculated by Hankel and Bessel functions". It gives no numbers that would reconcile the 1932 "λ ≈ 3 × diameter" figures.
Claims 2-3 (treatment of substances): the ellipsoid applicator is the first design in the family for flowing a substance through a focused field, with temperature control. It reports no result.
Source-gap note: GB448418's content is now represented by its probable US twin. The GB text itself is still not obtained, because Espacenet blocked access.

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