IP Library › Granted Patent US 1,106,421
Granted Patent S1
US 1,106,421 · App. 29/880,898 · Granted Dec 16, 2025

Air filter

Inventor: Renliang Huang (Zhejiang, CN)
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Quick Facts
Patent No.
US 1,106,421
App. No.
29/880,898
Granted
Dec 16, 2025
Kind
S1
Claims (1)

The ornamental design for an air filter as shown and described.

References Cited (10)
US D927673S · Hanson · 2021 [cited by examiner]
US D927674S · Hanson · 2021 [cited by examiner]
US D927675S · Hanson · 2021 [cited by examiner]
US D927677S · Hanson · 2021 [cited by examiner]
US D928300S · Hanson · 2021 [cited by examiner]
US D928301S · Hanson · 2021 [cited by examiner]
US D928303S · Hanson · 2021 [cited by examiner]
US 11859891B2 · Hanson · 2024 [cited by examiner]
US 20210018247A1 · Hanson · 2021 [cited by examiner]
Air Filter Replacement for Frigidaire. “Romon Filter Replacement.” www.amazon.com. Online retail page. Mon. Mar. 31, 2025. Shown in pp. 1,3,5-7. Full URL: https://www.amazon.com/Refrigerator-Replacement-Frigidaire-Compa… [cited by examiner]