US 3220960
Forward Citations
How Soft Contact Lenses Were Invented Using Hydrogels
Patents that cite US 3220960 — inventions that reference this patent as foundational prior art in their own applications. High forward citation counts indicate an influential patent.
CITED BY
228 patents
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This patent has been cited by 228 later patents. Citation detail pages are being built out in Phase 2.
Forward citation data is sourced from the USPTO patent database. Only patents indexed in PatentBrief are shown as links.