Invalidity dossier
US 134900
Improvement in steam-condensers
Added 9/24/2026, 1:12:14 AM
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Patent summary
Title, assignee, inventors, filing/issue dates, abstract, and a plain-language overview of the claims.
Patent Overview: US 134,900 — "Improvement in Steam-Condensers"
Patent number: US 134,900 (also rendered US134900A / US134900D)
Title: Improvement in Steam-Condensers
Inventor: Ernst Körting, of Vienna, Austria
Publication/grant date: January 14, 1873
Assignee: None identified in the supplied text
Status per source: Expired – Lifetime (anticipated expiration January 14, 1890)
Purpose. The invention is a steam condenser driven by a high-pressure jet of cold water. Exhaust steam from an engine cylinder (A) enters through pipe (B) into a condensing cone (G); a water nozzle (D) extends inward past the steam-pipe mouth, leaving an annular space so steam surrounds the water jet and blows forward. A central spindle (E) makes the water issue as a hollow tubular jet, which condenses the steam and carries the condensate into a diverging discharge nozzle (F), whose velocity overcomes atmospheric pressure and discharges to open air. Condensation establishes a vacuum communicated back to the engine cylinder. Three figures show variants: Fig. 1 (solid spindle), Fig. 2 (hollow spindle forming a live-steam nozzle connected to pipe I), and Fig. 3 (an additional concentric nozzle L inserted through spindle E for water, with live steam blown through E).
Plain-language scope (claims). Three claims: (1) the cock G communicating with open air, in combination with the condenser; (2) the central spindle or nozzle mounted within water-nozzle D and extending into condensing-nozzle G; (3) the concentric nozzles E and L mounted within water-nozzle D — one for water, one for fresh steam — arranged substantially as described. The specification states the high-pressure cold-water jet is forced inward by outside independent means and "serves alone and by itself" to operate the condenser; the steam jets are described as unessential, used only to start a vacuum and raise water temporarily.
What the excerpt does not establish. It does not identify an assignee, any litigation, ownership transfer, validity determination, or specific prior art. The text is partially garbled/OCR-corrupted (e.g., "condensing-ma zle," a truncated claim 2, and a fragment about steam-jets), so claim 2's full wording cannot be confirmed from this excerpt. Classifications listed (B01F25/31242) and cited-by entries appear as metadata only.
Source: https://patents.google.com/patent/[US134900](/patent/US134900)/en
Generated 10/1/2026, 9:31:33 PM
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PTAB challenges
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Assignment history
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Prior art
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Obviousness
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Extensions
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Derivative works
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