Comprehensive design for two interactive tools:
- Prozesskostenrechner: DE (LG/OLG/BGH/BPatG), UPC, and EPA cost estimates
- Fristenrechner: Patent deadline calculator with holiday adjustment
Covers UI layout, data models, API contracts, calculation logic,
fee tables (GKG/RVG/PatKostG/UPC/EPA), deadline rules for all
proceeding types, and phased implementation plan.
Key differentiator: EPA proceedings coverage (not in KanzlAI).
