Inventor
Helmut Schulze
Inventor
Wuppertal, DE
Overview
Patents· 9 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
B01Dprimary
B01DSeparation29%
C08GMacromolecular compounds obtained otherwise than by reactions only involving unsaturated carbon-to-carbon bonds18%
C08BPolysaccharides6%
C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients6%
C10LFuels not otherwise provided for6%
D21CProduction of cellulose by removing non-cellulose substances from cellulose-containing materials6%
D21HPulp compositions6%
H02HEmergency protective circuit arrangements6%
H02PControl or regulation of electric motors, electric generators or dynamo-electric converters6%
Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests6%
PatentTitleYear
4,814,440'Process for producing extractive-material-reduced cellulose'19894,772,393'Cellulose dialysis membrane with improved biocompatibility'19884,741,927'Production of cellulose dialysis membrane with improved biocompatibility'19884,668,396'Dialysis membrane of modified cellulose with improved biocompatibility'19874,391,964'Embedding mass of polyurethane'19834,369,492'Device for the protection of a converter which converts an impressed D-C current from a current source into an A-C current fed to a load'19834,263,542'Method and circuit arrangement for controlling an asynchronous motor supplied from a static frequency changer'19814,256,869'Polyurethanes from trans-cyclohexane-1,4-diisocyanate'19814,024,307'Polyurethane solutions'1977Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1977–1989Patents assigned to AKZO NV (7)· patent assignee history
1977Based in Erlenbach, DE· patent location history
1981–1983Patents assigned to BBC BROWN BOVERI & CIE (2)· patent assignee history
1981–1983Based in Ober-Ramstadt, DE· patent location history
1981Based in Aschaffenburg, DE· patent location history
1983–1988Based in Wuppertal, DE· patent location history
1989Based in Grosswallstadt, DE· patent location history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| AKZO NV | 7 | 1977–1989 |
| BBC BROWN BOVERI & CIE | 2 | 1981–1983 |
Locations
| Location | Patents | Span |
|---|---|---|
| Wuppertal, DE | 4 | 1983–1988 |
| Ober-Ramstadt, DE | 2 | 1981–1983 |
| Grosswallstadt, DE | 1 | 1989 |
| Aschaffenburg, DE | 1 | 1981 |
| Erlenbach, DE | 1 | 1977 |