Priority claimed from US09/408,656 external-priority patent/US6158859A/en Application granted granted Critical Publication of US5997138A publication Critical patent/US5997138A/en Anticipated expiration legal-status Critical Status Expired - Fee Related legal-status Critical Current Links Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.) Filing date Publication date Application filed by US Department of Navy filed Critical US Department of Navy Priority to US09/120,875 priority Critical patent/US5997138A/en Assigned to NAVY, UNITED STATES OF AMERICA, REPRESENTED BY THE SECRETARY, THE reassignment NAVY, UNITED STATES OF AMERICA, REPRESENTED BY THE SECRETARY, THE ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS).
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Suiter Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Fee Related Application number US09/120,875 Inventor Harold R.
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Google Patents Diver's face mask having aspheric, afocal lens system providing unit magnification for use as a window between air and waterĭownload PDF Info Publication number US5997138A US5997138A US09/120,875 US12087598A US5997138A US 5997138 A US5997138 A US 5997138A US 12087598 A US12087598 A US 12087598A US 5997138 A US5997138 A US 5997138A Authority US United States Prior art keywords lens concave convex flat interior Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google Patents US5997138A - Diver's face mask having aspheric, afocal lens system providing unit magnification for use as a window between air and water US5997138A - Diver's face mask having aspheric, afocal lens system providing unit magnification for use as a window between air and water
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