Patent US3931906A successfully refreshed from Google Patents.
US3931906A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bulbs for cathode tubes, particularly for television tubes
Assignee: Societe des Verreries Industrielles Reunies du Loing
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Filing: 1966-02-24
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Granted: 1976-01-13
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Expires: 1986-02-24
Abstract
Abstract A bulb for a cathode tube comprising a cone having a narrow end adapted to receive electronic devices therein and a wide substantially rectangular base end having a screen with a curved viewing portion secured thereto. The curved viewing screen is provided with a substantially rectangular peripheral contour complementary to the contour of the base end of the cone and the viewing portion is so curved that the sections therethrough parallel to the cone base end define curves which are substantially parallel to the cone base and contour.
Inventors
- 👤 Georges Bradu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:27
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/86; H01J29/861; H01J29/87; H01J5/00; H01J5/02; H01J2229/00; H01J2229/86; H01J2229/8613; H01J2229/8616
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
86 words
A bulb for a cathode tube comprising a cone having a narrow end and a wide substantially rectangular base end, a screen having a curved viewing portion having a substantially rectangular peripheral contour complementary to the contour of the base end of said cone, said viewing portion being so curved that sections therethrough parallel to said base cone end define curves which are substantially parallel to said cone base end contour, and means securing together said cone base end and said screen at their respective edges.
Claim 2
Dependent Claim
86 words
A bulb for a cathode tube comprising a cone having a narrow end and a wide substantially rectangular base end, a screen having a curved viewing portion having a substantially rectangular peripheral contour complementary to the contour of the base end of said cone, said viewing portion being so curved that sections therethrough parallel to said base cone end define curves which are substantially parallel to said cone base end contour, and means securing together said cone base end and said screen at their respective edges.
Claim 3
Dependent Claim
31 words
A bulb according to claim 1 wherein the substantially rectangular peripheral contour of said curved viewing portion of the screen is secured directly to the rectangular base end of said cone.
Claim 4
Dependent Claim
31 words
A bulb according to claim 1 wherein said screen further comprises apron means having four substantially rectangular walls of constant equal height disposed about the rectangular peripheral contour of said screen.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-01-12 | 1979-07-14 | 1980-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-12 | 1983-07-14 | 1984-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-12 | 1987-07-14 | 1988-01-13 | $7700.00 | Window Closed / Lapsed |