Jack Ditcher
18Patents
15h-index
4Co-inventors
67Inventor score
Filing activity: Feb 17, 1981 → Apr 2, 1997
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4387900A | Method and apparatus for providing watertight seal for manhole pipe connection | Emerging Cross-Sectional Technologies | 66 | Expired |
| US4621941A | Manhole riser having integral flexible waterlock for manhole covers and having a water tight seal for sealed manhole covers | Fixed Constructions | 44 | Expired |
| US4751799A | Method and apparatus for lining manhole assemblies and the like | Fixed Constructions | 40 | Expired |
| US4540310A | Manhole riser and cooperating sleeve to provide a waterlock for manhole structures | Fixed Constructions | 38 | Expired |
| US4737220A | Method of making a manhole riser having integral flexible waterlock for manhole covers and having a water tight seal for sealed manhole covers | Emerging Cross-Sectional Technologies | 32 | Expired |
| US5114162A | Gasket for use in manhole bases and the like | Mechanical Engineering; Lighting; Heating | 31 | Expired |
| US4422994A | Method and apparatus for forming inverts in manhole assemblies, and the like | Fixed Constructions | 27 | Expired |
| US4941643A | Apparatus for forming inverts and manhole assemblies and the like utilizing adjustable invert forming members joined with an intermediate flexible portion | Fixed Constructions | 25 | Expired |
| US4565347A | Monolithic precast invert system | Fixed Constructions | 24 | Expired |
| US4903970A | Apparatus for providing a watertight seal for manhole pipe connections including a foldable gasket and clamping band assembly and expansion means for installing the gasket and clamping band assembly | Emerging Cross-Sectional Technologies | 21 | Expired |
| US4566483A | Drop manhole precast encasement | Emerging Cross-Sectional Technologies | 19 | Expired |
| US4801417A | Methods for forming inverts in manhold assemblies | Performing Operations; Transporting | 18 | Expired |
| US4711455A | Gasket for use in manholes and including clamping band having cooperating projections and grooves for preventing relative axial movement of the opposing ends of the clamping band during installation and for facilitating expansion by an expansion jack | Emerging Cross-Sectional Technologies | 18 | Expired |
| US4685650A | Apparatus for forming inverts and manhole assemblies | Performing Operations; Transporting | 18 | Expired |
| US4618464A | Precast concrete manhole adjustable bolt slot for securing cast iron frame and cover and method for casting same | Fixed Constructions | 16 | Expired |
| US4719724A | Precast concrete manhole adjustable bolt slot assembly for securing cast iron frame and cover | Fixed Constructions | 11 | Expired |
| US5127770A | Retaining wall assembly utilizing face panels interlocked with tie-back/anchors | Fixed Constructions | 9 | Expired |
| US5860771A | Retaining wall/tie-back/anchor assembly | Fixed Constructions | 3 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.