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| US4208747 | 11 janv. 1979 | 24 juin 1980 | The Procter & Gamble Company | Passive dosing dispenser employing trapped air bubble to provide air-lock |
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| US4249274 | 3 déc. 1979 | 10 févr. 1981 | The Procter & Gamble Company | Apparatus for sanitizing toilets |
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| US4307474 | 28 mai 1980 | 29 déc. 1981 | The Procter & Gamble Company | Passive dosing dispenser exhibiting improved resistance to clogging |
| US4308625 | 18 août 1980 | 5 janv. 1982 | The Procter & Gamble Company | Article for sanitizing toilets |
| US4357718 | 25 juin 1980 | 9 nov. 1982 | | Liquid dispenser |
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| US4375109 | 22 févr. 1982 | 1 mars 1983 | The Drackett Company | Passive dispenser having a double air vent system |
| US4491988 | 28 janv. 1983 | 8 janv. 1985 | Economics Laboratory, Inc. | In-tank toilet bowl cleaner dispenser |
| US4896382 | 5 déc. 1988 | 30 janv. 1990 | Block Drug Company, Inc. | Automatic toilet bowl cleaner with a metered dispensing of cleaning composition |
