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| Patents for E05B 11 - Devices preventing keys from being removed from the lock (310) |
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| 02/16/1982 | US4315420 Retained key double cylinder deadbolt | | 11/17/1981 | US4300374 Key retaining cylinder for a lock | | 03/10/1981 | US4254648 Inner locking cylinder with captive key | | 11/11/1980 | CA1089246A1 Trapped key mechanism | | 07/29/1980 | CA1082478A1 Lock with normally non-removable key and auxiliary key removal device for use in interior locksets | | 01/23/1979 | CA1046787A1 Key retaining cylinder for a lock | | 10/17/1978 | US4120184 Lock with normally non-removable key and auxiliary key removal device for use in interior locksets | | 08/29/1978 | US4109496 Trapped key mechanism | | 07/26/1977 | US4037440 Security lock for doors | | 06/14/1977 | US4028917 Key retaining cylinder for a lock |
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