Hch. Bertrams Aktiengesellschaft

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Records under this name other than patents Hch. Bertrams Aktiengesellschaft holds now: patents now held by others, patents whose terms have ended, and its applications, pending or abandoned.

Showing 1 to 7 of 7 · Back to Hch. Bertrams Aktiengesellschaft

Patent	Title	Status	Expires	Confidence
US 3,933,575	Separation of corrosive liquid mixtures Term ended Term ended no later than Jan 20, 1996 · Low confidence	Term ended	Term ended no later than Jan 20, 1996	Low confidence
US 4,014,735	Concentration and separation of corrosive liquid mixtures Term ended Term ended no later than Mar 29, 1997 · Low confidence	Term ended	Term ended no later than Mar 29, 1997	Low confidence
US 4,138,309	Multi-stage apparatus for concentrating sulphuric acid Term ended Term ended no later than Feb 6, 1999 · Low confidence	Term ended	Term ended no later than Feb 6, 1999	Low confidence
US 4,164,441	Process and apparatus for concentrating corrosive liquid using radiant heat Term ended Term ended no later than Aug 14, 1999 · Low confidence	Term ended	Term ended no later than Aug 14, 1999	Low confidence
US 4,187,904	Heat transfer installation having storage reservoir containing a salt as a heat carrier Term ended Term ended no later than Feb 12, 2000 · Low confidence	Term ended	Term ended no later than Feb 12, 2000	Low confidence
US 4,236,974	Process and apparatus for purifying waste waters Term ended Term ended no later than Dec 2, 2000 · Low confidence	Term ended	Term ended no later than Dec 2, 2000	Low confidence
US 4,279,693	Process for purifying polluted fluids Term ended Term ended no later than Jul 21, 2001 · Low confidence	Term ended	Term ended no later than Jul 21, 2001	Low confidence