Patent DE2809409C3 successfully refreshed from Google Patents.
DE2809409C3
Expired / Lapsed
DE
⏱️ 0.0 years remaining
Specifically light B ↓ 2 ↓ O ↓ 3 ↓ -CaO spectacle lens with a specific gravity of 2.88 to 3.18, a refractive index n ↓ D ↓ 1.68 to 1.71 and an Abbe number ↓ υ ↓↓ D ↓ 41.6 to 46.5
Assignee: Nikon Corp
•
Filing: 1978-03-04
•
Granted: 1982-12-23
•
Expires: 1998-03-04
Abstract
No abstract record available.
Inventors
- 👤 Takeo Tokyo Ichimura
Bibliographic Details
Application Number
—
Jurisdiction
DE
Data Source
google_patents
Last Synchronized
2026-11-08 23:14
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/062; C03C3/064; C03C3/068; C03C3/12; C03C3/14
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.