Alfred Hengst

E. Leitz + Leica Photographic Patents by Alfred Hengst of Lahnau, Germany

• 1975 APR 28 - BINOCULARS WITH DOUBLE BRIDGE AND RESILIENT BIASING (see Trinovid 8 x 20 C)
• 1977 SEP 27 - BINOCULARS (Canadian Patent see right image above)
• 1978 APR 17 - ILLUMINATION SYSTEM FOR PHOTOGRAPHIC ENLARGERS
• 1980 MAY 20 - BINOCULAR TELESCOPE WITH INTERNAL FOCUSING
• 1981 SEP 25 - BINOCULAR with Heinrich Janke and Hans-Kurt Uellenberg (see Trinovid 8 x 20 BC.)
• 1981 SEP 25 - BINOCULAR with Heinrich Janke, Heinz Keiner and Hans-Kurt Uellenberg (see Trinovid 8 x 32 BA)
• 1984 MAY 03 - BINOCULAR with Heinrich Janke and Hans-Kurt Uellenberg
• 1984 MAY 23 - BINOCULAR with Heinrich Janke and Hans-Kurt Uellenberg
• 1989 SEP 08 - BINOCULAR TELESCOPE WITH COUPLED JOINT FOCUSING AND UNCOUPLED SEPARATE FOCUSING with H. Peter Farnung and Heinz Keiner (1st Leica Patent)
• 1989 DEC 22 - BINOCULAR TELESCOPE WITH RADIALLY ACTING COMPENSATING SPRING with H. Peter Farnung and Heinz Keiner
• 1990 MAR 28 - PAIR OF BINOCULARS with H. Peter Farnung, Heinrich Janke and Heinz Keiner see Trinovid 10 x 32 BN
• 1993 SEP 15 - MONOCULAR TELESCOPE HAVING A FOCUSING UNIT WHOSE MECHANICAL SENSITIVITY CAN BE VARIED with Heinz Keiner and Lothar Kölsch
• 1995 MAR 10 - SUSPENSION LUG AND LOCKING ELEMENT FOR A CARRYING STRAP with Ernst Ruehl
• 1996 JUL 29 - CAMERA HOUSING with Manfred Meinzer (see above and R8)
• 2002 AUG 10 - METHOD AND DEVICE FOR FOCUSING AND DIOPTER COMPENSATION OF A TELESCOPE with Sigrun Kammans and Gernot Kettler
• 2002 AUG 14 - ARRANGEMENT FOR ROTATABLE ADJUSTMENT OF A CAP ON AN EYEPIECE HOUSING with Philipp Syre
• 2003 JAN 09 - PLAY-FREE ROTARY MOUNTING with Rolf Speier (see Ultravid 8 x 20 BL)
• 2004 APR 20 - ARRANGEMENT FOR ROTATABLE ADJUSTMENT OF A CAP ON AN EYEPIECE HOUSING with Philipp Syre
• 2005 MAY 18 - FOCUSING DEVICE WITH DIOPTER ADJUSTMENT with Rolf Speier (see Ultravid 8 x 20 BL)