US3341391A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spherical shaped plastic filter for cathode ray tube
Assignee: McDonnell Douglas Corp
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Filing: 1964-04-08
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Granted: 1967-09-12
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Expires: 1984-04-08
Abstract
No abstract record available.
Inventors
- 👤 Vern E Hamilton
- 👤 Luther M Roseland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:48
CPC Classifications
G; G02; G02B; G02B5/00; H; H01; H01J; H01J29/00; H01J29/86; H01J29/89; H01J29/896; Y; Y10; Y10T; Y10T428/00; Y10T428/21; Y10T428/24; Y10T428/24802; Y10T428/31504; Y10T428/31507; Y10T428/31551; Y10T428/31573; Y10T428/31587; Y10T428/31855; Y10T428/31909; Y10T428/31924; Y10T428/31928
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
69 words
A TRANSPARENT LIGHT FILTER BODY COMPRISING A PLURALITY OF LAYERS OF PLASTIC FILM SELECTED FROM THE GROUP CONSISTING OF POLYCARBONATE AND POLYSTYRENE, EACH OF SUCH LAYERS HAVING GRID PATTERNS SUPERIMPOSED THEREON, SAID GRID PATTERNS OF ADJACENT LAYERS BEING SUBSTANTIALLY IN DEPTHWISE ALIGNMENT, SAID LAYERS BEING ADHESIVELY BONDED TOGETHER BY A CURED TRANSPARENT URETHANE POLYMER, SAID FILTER BODY BEING SPHERICALLY SHAPED AND ADAPTED TO FIT OVER A CATHODE RAY TUBE.
Claim 2
Dependent Claim
69 words
A TRANSPARENT LIGHT FILTER BODY COMPRISING A PLURALITY OF LAYERS OF PLASTIC FILM SELECTED FROM THE GROUP CONSISTING OF POLYCARBONATE AND POLYSTYRENE, EACH OF SUCH LAYERS HAVING GRID PATTERNS SUPERIMPOSED THEREON, SAID GRID PATTERNS OF ADJACENT LAYERS BEING SUBSTANTIALLY IN DEPTHWISE ALIGNMENT, SAID LAYERS BEING ADHESIVELY BONDED TOGETHER BY A CURED TRANSPARENT URETHANE POLYMER, SAID FILTER BODY BEING SPHERICALLY SHAPED AND ADAPTED TO FIT OVER A CATHODE RAY TUBE.
References Cited (Backward Citations)
US2980567A
Cited
US3133853A
Cited
US3117046A
Cited
US3255068A
Cited
US3170178A
Cited
US3194885A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-09-11 | 1971-03-13 | 1971-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-11 | 1975-03-13 | 1975-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-11 | 1979-03-13 | 1979-09-12 | $7700.00 | Window Closed / Lapsed |