Assignee
HEGLER WILHELM
DE·26 granted patents·913 citations·filing 1974–1995
Top patents by PatentIndex Score
26 records- 0192US3996323AMethod of producing double-walled synthetic plastics tubes having an outer wall with annular or helical corrugationsHEGLER WILHELM·Filed 1975·Granted Dec 7, 1976·54 cites·9 claims
- 0291US5320797AMethod and apparatus for the continuous manufacture of a compound pipe with a pipe socketHEGLER WILHELM·Filed 1993·Granted Jun 14, 1994·89 cites·14 claims
- 0390US4492551AApparatus for the production of plastic pipes with transverse groovesHEGLER WILHELM·Filed 1982·Granted Jan 8, 1985·63 cites·2 claims
- 0488US4513787ACorrugated sheathing hoseHEGLER WILHELM·Filed 1983·Granted Apr 30, 1985·53 cites·14 claims
- 0588US4303104ADouble-wall plastic tubing in which the outer wall has transverse corrugations and the inner wall is smoothHEGLER WILHELM·Filed 1980·Granted Dec 1, 1981·49 cites·5 claims
- 0688US4212618AApparatus for the manufacture of transversely contoured tubing from thermoplastic materialHEGLER WILHELM·Filed 1979·Granted Jul 15, 1980·48 cites·21 claims
- 0786US4779651APlastic corrugated tube with integrally molded sleeve couplerHEGLER WILHELM·Filed 1987·Granted Oct 25, 1988·61 cites·7 claims
- 0885US5071173APlastic pipe for sewer pipe reconstructionHEGLER WILHELM·Filed 1990·Granted Dec 10, 1991·63 cites·13 claims
- 0983US4006599APlastic drain pipe and apparatus for producing the sameHEGLER WILHELM·Filed 1975·Granted Feb 8, 1977·31 cites·16 claims
- 1082US4900503AMethod and apparatus for producing a finned tube from synthetic plastics materialHEGLER WILHELM·Filed 1988·Granted Feb 13, 1990·43 cites·14 claims
- 1181US4930936APartial-seepage drainage pipe with mating sleeveHEGLER WILHELM·Filed 1984·Granted Jun 5, 1990·27 cites·14 claims
- 1280US3994644AExtruder head for extruding an outer tube or sheath about an inner tube or cableHEGLER WILHELM·Filed 1974·Granted Nov 30, 1976·32 cites·8 claims
- 1376US5346384AApparatus for the production of plastic pipesHEGLER WILHELM·Filed 1992·Granted Sep 13, 1994·43 cites·6 claims
- 1475US3976414AApparatus for the production of double-walled synthetic plastic tubes having a transversely corrugated outer wall and a smooth inner wallHEGLER WILHELM·Filed 1975·Granted Aug 24, 1976·29 cites·16 claims
- 1574US4145387AMethod of manufacturing double-wall plastic tubing in which the outer wall has transverse corrugations and the inner wall is smoothHEGLER WILHELM·Filed 1977·Granted Mar 20, 1979·24 cites·7 claims
- 1673US4158534AApparatus for cutting openings at arbitrarily selectable intervals into pipesHEGLER WILHELM·Filed 1977·Granted Jun 19, 1979·20 cites·16 claims
- 1769US5320697AMethod for welding together pipes consisting of thermoplastic plasticsHEGLER WILHELM·Filed 1992·Granted Jun 14, 1994·28 cites·15 claims
- 1867US5472659AMethod for continuously manufacturing compound corrugated pipe having smooth portionsHEGLER WILHELM·Filed 1993·Granted Dec 5, 1995·31 cites·2 claims
- 1963US5393211AApparatus for the manufacture of a plastic pipe having transverse profile featuresHEGLER WILHELM·Filed 1993·Granted Feb 28, 1995·28 cites·5 claims
- 2062US5560941AApparatus for the manufacture of corrugated pipes of thermoplastic plasticsHEGLER WILHELM·Filed 1995·Granted Oct 1, 1996·22 cites·6 claims
- 2158US4381276AProcess and apparatus for the fabrication of a flat-shaped hollow bodyHEGLER WILHELM·Filed 1981·Granted Apr 26, 1983·18 cites·9 claims
- 2250US5953974AApparatus for cutting slots in corrugated and twin-wall pipesHEGLER WILHELM·Filed 1994·Granted Sep 21, 1999·13 cites·8 claims
- 2350US4488467AApparatus for cutting openings in pipesHEGLER WILHELM·Filed 1982·Granted Dec 18, 1984·10 cites·7 claims
- 2446US5489403AMethod for welding pipe pieces made of thermoplasticsHEGLER WILHELM·Filed 1994·Granted Feb 6, 1996·12 cites·6 claims
- 2546US5141427AApparatus for the production of plastic pipesHEGLER WILHELM·Filed 1991·Granted Aug 25, 1992·12 cites·5 claims
- 2642US5511964AApparatus for the production of plastic pipesHEGLER WILHELM·Filed 1992·Granted Apr 30, 1996·10 cites·7 claims
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