Patent US4763187B1 successfully refreshed from Google Patents.
← Back to Patent Explorer
US4763187B1 Expired / Lapsed US ⏱️ 0.0 years remaining

Method of forming images on a flat video screen

Assignee: ETUDE DES SURFACES LAB
•
Filing: 1985-03-08
•
Granted: 1997-11-04
•
Expires: 2005-03-08
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract A device and method for formation of images with flat video screens by a line- and column-addressed point matrix. Field point matrix uses field emission micro tips as fluorescent screen portions being connected in columns. An electric field is applied between each tip and the fluorescent screen portion corresponding thereto, such that the respective tip emits electrons and a light spot is formed on the video screen, the intensity of which depends upon the applied voltage for attracting electrons. Emission from other tips is blocked by applying a negative voltage to the other columns. Thus, by successive switchings, successive luminous spots are formed on the video screen as desired.

Inventors

  • 👤 Jean P Biberian

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-05 21:59
CPC Classifications
H; H01; H01J; H01J31/00; H01J31/08; H01J31/10; H01J31/12; H01J31/123; H01J31/125; H01J31/127

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

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 2000-11-03 2001-05-05 2001-11-04 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 2004-11-03 2005-05-05 2005-11-04 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2008-11-03 2009-05-05 2009-11-04 $7700.00 Window Closed / Lapsed

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag