| Patents for A63C 19 - Design or layout of playing courts, rinks, bowling greens or areas for water-skiing; Covers therefor (2,977) |
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| 05/19/1982 | EP0051631A1 Ice rink cover |
| 03/18/1982 | WO1982000771A1 Surface wave generating device |
| 01/12/1982 | US4310588 Self-lubricating base of silicone resin, polyvinylidene fluoride or furan resin |
| 01/12/1982 | CA1116196A1 Volley tennis game |
| 01/05/1982 | US4309031 Strike zone pad |
| 11/24/1981 | US4302125 Ground area marker, especially for a golf course |
| 11/17/1981 | US4301207 Floor covering for indoor sports arena |
| 10/29/1981 | WO1981003012A1 Thermal ice cap |
| 09/22/1981 | CA1109223A1 Wall system |
| 08/25/1981 | US4285514 Ramp device for practicing wheeled sports |
| 08/18/1981 | US4284273 Apparatus for raking and levelling sand in a pit |
| 08/04/1981 | US4281802 Thermal ice cap |
| 06/23/1981 | US4274626 Exercise floor |
| 05/19/1981 | US4268029 Recreational basketball apparatus with multiple moving goals |
| 05/19/1981 | CA1101455A1 Permanent athletic field marker |
| 05/12/1981 | US4266764 Recreational basketball apparatus with moving goal |
| 03/31/1981 | US4258911 Skateboard arena |
| 12/02/1980 | US4236362 Wall system |
| 10/21/1980 | CA1087922A1 Means for accelerating the speed on a ski jump |
| 09/17/1980 | EP0015432A1 Surfacing for sports localities having a solid substructure |
| 09/16/1980 | CA1085800A1 Laying down of large sheets of film |
| 08/19/1980 | US4218059 Field marker |
| 08/06/1980 | EP0014186A1 Method of manufacturing tubes for lighting poles and the like |
| 05/20/1980 | US4203594 Soccer court |
| 05/13/1980 | US4202543 Recreational basketball court facility |
| 04/22/1980 | US4199639 Sandwich-structured double layer floor covering |
| 03/25/1980 | CA1074355A1 Divider net with replaceable bottom panel for playing courts |
| 03/20/1980 | WO1980000467A1 Wall system |
| 02/12/1980 | US4188018 Means for accelerating the speed on a ski jump |
| 10/30/1979 | US4172593 Roller skating rink |
| 09/04/1979 | US4166617 Field game |
| 09/04/1979 | CA1061584A1 Method of creating an outdoor ice slab in summer weather and of reducing energy requirements for indoor and outdoor ice rinks |
| 07/24/1979 | CA1059081A1 Spraying apparatus |
| 07/17/1979 | US4161723 Flagpole particularly for indicating goals in skiing competitions |
| 07/10/1979 | US4160324 Tool for layout of baseball diamonds (Du-Ber) |
| 04/10/1979 | US4148477 Simulated ski slope slide structure |
| 03/27/1979 | US4146221 Platform paddle tennis court deck and associated equipment |
| 03/27/1979 | CA1051472A1 Kerb for tracks and the like for light-athletics |
| 03/27/1979 | CA1051209A1 Chiller for ice rink refrigeration systems |
| 02/07/1979 | EP0000562A1 Two-layer floor covering with sandwich structure for playgrounds and sports grounds and method of production |
| 02/06/1979 | US4137583 Gymnastic mat |
| 12/19/1978 | US4130283 Simulated fairway surface for golf apparatus |
| 12/19/1978 | US4129916 Adjustable skateboard ramp |
| 10/24/1978 | US4121821 Skateboard rink and method |
| 08/22/1978 | US4108439 Sprinkler head locater and marker and method |
| 08/01/1978 | US4103886 Permanent athletic field marker |
| 07/25/1978 | US4102405 Golf sand-trap smoothing implement |
| 07/25/1978 | US4102101 Glass panes, and buildings and the like including glass panes |
| 05/23/1978 | US4090708 Apparatus for marking football fields |
| 05/02/1978 | US4087088 Moving artificial ski surface construction |
| 05/02/1978 | US4087048 Spraying apparatus |
| 04/18/1978 | US4084813 Toe board and measuring means |
| 03/14/1978 | US4078793 Portable apparatus for delineating a playing area |
| 12/20/1977 | US4063729 Portable pitching mound |
| 12/13/1977 | US4062519 Pulley lift assembly and curtain system employing same |
| 11/29/1977 | US4060244 Retractable anchors for game bases |
| 09/27/1977 | US4050972 Laying down of large sheets of film |
| 08/30/1977 | US4045022 No-line tennis court |
| 08/02/1977 | US4038834 Ice skating arena |
| 06/28/1977 | US4032139 Process for extending the seasonal useful life of ski trails and ski trails produced thereby |
| 05/10/1977 | US4022651 Basketball courts |
| 05/10/1977 | US4022452 Pole guard |
| 03/29/1977 | US4014521 Divider net with replaceable bottom panel |
| 11/09/1976 | US3990800 Line marker on ice |
| 10/12/1976 | US3985359 Portable sports court boundary |
| 10/05/1976 | US3983713 Method of creating and outdoor ice slab in summer weather and of reducing energy requirements for indoor and outdoor ice rinks |
| 09/28/1976 | US3982754 Apparatus for constructing structures, particularly for children's playgrounds and gardens |
| 07/27/1976 | US3971560 Fluorescent table tennis assembly |
| 07/27/1976 | US3971558 Base marker for baseball |
| 06/29/1976 | US3965596 Improvements in or relating to a marking system |
| 06/08/1976 | US3961751 Artificial cross-country skiing path |
| 05/04/1976 | US3954499 Method and apparatus for removing dew from a green |
| 04/06/1976 | US3948512 Recreational facility |
| 03/30/1976 | US3946529 Floor for sports and in particular for roller skating |
| 02/17/1976 | US3938804 Safety base for athletic events |
| 02/10/1976 | US3937861 Needlepunch, polyurethane elastomer, multilayer |
| 01/06/1976 | US3930647 Skating rink assembled from a kit |