Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
Home › Key telephone call signalling circuit

Key telephone call signalling circuit

US Patent 4185173 · Granted Jan 22, 1980

Estimated economic value: $687,000 ⓘ

Assignee

Inventors

View full patent text on Google Patents →

More Patents by These Inventors

Decorative material, laminate, and method for manufacturing decorative material2025
High-strength cold-rolled steel sheet, high-strength coated or plated steel shee2025
Substrate transfer apparatus2025
Medical device having space for assisting in embedding of bio sample in embeddin2025
Display device having light-emitting element and light source element irradiatin2025
High-strength steel sheet and method for producing same2025
Wire harness2025
Analysis device, analysis method, trace liquid collection device, and trace liqu2024
Film processing method2024
Wire harness2024
Display device2024
Wire harness2024