Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
Home › Ink pen refill with diversely colored gel ink layers and method of manufacture

Ink pen refill with diversely colored gel ink layers and method of manufacture

US Patent 6267523 · Granted Jul 31, 2001

Assignee

Inventors

View full patent text on Google Patents →

More Patents by These Inventors

Straw cup2025
Bottle2025
Lighter1992