Issued Patents All Time
Showing 26–45 of 45 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5489403 | Method for welding pipe pieces made of thermoplastics | Wilhelm Hegler | 1996-02-06 |
| 5472659 | Method for continuously manufacturing compound corrugated pipe having smooth portions | Wilhelm Hegler | 1995-12-05 |
| 5393211 | Apparatus for the manufacture of a plastic pipe having transverse profile features | Wilhelm Hegler | 1995-02-28 |
| 5346384 | Apparatus for the production of plastic pipes | Wilhelm Hegler | 1994-09-13 |
| 5320697 | Method for welding together pipes consisting of thermoplastic plastics | Wilhelm Hegler | 1994-06-14 |
| 5320797 | Method and apparatus for the continuous manufacture of a compound pipe with a pipe socket | Wilhelm Hegler | 1994-06-14 |
| 5141427 | Apparatus for the production of plastic pipes | Wilhelm Hegler | 1992-08-25 |
| 5071173 | Plastic pipe for sewer pipe reconstruction | Wilhelm Hegler | 1991-12-10 |
| 4930936 | Partial-seepage drainage pipe with mating sleeve | Wilhelm Hegler | 1990-06-05 |
| 4915425 | Pipe connecting element | Wilhelm Hegler | 1990-04-10 |
| 4900503 | Method and apparatus for producing a finned tube from synthetic plastics material | Wilhelm Hegler | 1990-02-13 |
| 4779651 | Plastic corrugated tube with integrally molded sleeve coupler | Wilhelm Hegler | 1988-10-25 |
| 4773451 | Double tubing comprising two protective tubes integrally joined to one another by a web | Wilhelm Hegler | 1988-09-27 |
| 4513787 | Corrugated sheathing hose | Wilhelm Hegler | 1985-04-30 |
| 4492551 | Apparatus for the production of plastic pipes with transverse grooves | Wilhelm Hegler | 1985-01-08 |
| 4488467 | Apparatus for cutting openings in pipes | Wilhelm Hegler | 1984-12-18 |
| 4381276 | Process and apparatus for the fabrication of a flat-shaped hollow body | Wilhelm Hegler | 1983-04-26 |
| 4303104 | Double-wall plastic tubing in which the outer wall has transverse corrugations and the inner wall is smooth | Wilhelm Hegler | 1981-12-01 |
| 4212618 | Apparatus for the manufacture of transversely contoured tubing from thermoplastic material | Wilhelm Hegler | 1980-07-15 |
| 4184831 | Apparatus for producing plastic drain pipes | Wilhelm Hegler | 1980-01-22 |