| Born | 26 Apr, 1915 | Berlin |
| Died | 2 Jan, 1987 |
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Ranks
Decorations |
U-boat Commands
| U-30 | 1 Apr, 1941 | - | Apr, 1941 | No war patrols |
| U-373 | 22 May, 1941 | - | 25 Sep, 1943 | 12 patrols (372 days) |
Patrol info
| U-boat | Departure | Arrival | |||||
| 1. | U-373 | 19 Jul, 1941 | Kiel | 20 Jul, 1941 | Horten | Patrol, | 2 days |
| 2. | U-373 | 30 Jul, 1941 | Horten | 1 Aug, 1941 | Trondheim | Patrol, | 3 days |
| 3. | U-373 | 4 Sep, 1941 | Trondheim | 2 Oct, 1941 | Brest | Patrol, | 29 days |
| 4. | U-373 | 31 Oct, 1941 | Brest | 21 Nov, 1941 | Lorient | Patrol, | 22 days |
| 5. | U-373 | 25 Dec, 1941 | Lorient | 15 Jan, 1942 | La Pallice | Patrol, | 22 days |
| 6. | U-373 | 25 Feb, 1942 | La Pallice | 26 Feb, 1942 | La Pallice | Patrol, | 2 days |
| 7. | U-373 | 1 Mar, 1942 | La Pallice | 17 Apr, 1942 | La Pallice | Patrol, | 48 days |
| 8. | U-373 | 18 May, 1942 | La Pallice | 8 Jul, 1942 | La Pallice | Patrol, | 52 days |
| 9. | U-373 | 6 Aug, 1942 | La Pallice | 4 Oct, 1942 | La Pallice | Patrol, | 60 days |
| 10. | U-373 | 22 Nov, 1942 | La Pallice | 3 Jan, 1943 | La Pallice | Patrol, | 43 days |
| 11. | U-373 | 25 Feb, 1943 | La Pallice | 13 Apr, 1943 | La Pallice | Patrol, | 48 days |
| 12. | U-373 | 7 Jul, 1943 | La Pallice | 16 Aug, 1943 | La Pallice | Patrol, | 41 days |
| 12 patrols, 372 days at sea | |||||||
Ships hit by Paul-Karl Loeser
| Date | Boat | Name of ship | Tons | Nat. | Convoy | Fate * | |
| 17 Mar, 1942 | U-373 | Mount Lycabettus | 4.292 |  | gr | ||
| 22 Mar, 1942 | U-373 | Thursobank | 5.575 |  | br | ||
| 24 Jun, 1942 | U-373 | John R. Williams [Mine] | 396 |  | am | ||
| 10.263 | |||||||
* Unless otherwise noted the ships listed here were sunk. | |||||||
Decorations and ranks information is in many cases not complete. If you can help on any of those missing that would be great.