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| Number | Title | Issue Date |
| 4317436 | Valve stem seal A seal for the valve stem of a poppet valve in an engine includes an elongated outer tubular body and a concentric inner tubular body with both bodies being connected at one end by a radial flexible web. The inner body is provided with an annular sealing ... | 03/02/1982 |
| 4198062 | Valve stem seal A valve stem seal for an intake or exhaust valve in an internal combustion engine where the seal allows a metered amount of oil to run down the valve stem for lubrication of the stem in its valve guide. The seal is formed of a relatively rigid valve seal ... | 04/15/1980 |
| 4124220 | Lubricant seals A lubricant seal is provided for use in the lubrication of rotating or reciprocating members which are subject to very severe ambient conditions, such as the stems of inlet or exhaust valves of internal combustion engines. The lubricant seal comprises a t... | 11/07/1978 |
