Patent US1428181A successfully refreshed from Google Patents.
Patent US3278779A successfully refreshed from Google Patents.
US3278779A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cathode-ray tube having an insulating spacer between the cathode and the control grid
Assignee: Rauland Borg Corp
•
Filing: 1962-05-17
•
Granted: 1966-10-11
•
Expires: 1982-05-17
Abstract
No abstract record available.
Inventors
- 👤 Constantin S Szegho
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:38
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/46; H01J29/48; H01J29/485
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
115 words
IN A CATHODE-RAY TUBE INCLUDING A CATHODE HAVING A CAP PORTION WITH ELECTRON EMISSIVE MATERIAL DEPOSITE THEREON AND A CONTROL ELECTRODE INCLUDING A PLANAR PORTION OF A PREDETERMINED THICKNESS ORIENTED SUBSTANTIALLY PARALLEL TO SAID CAP PORTION, SAID PLANAR PORTION HAVING AN APERTURE SMALL RELATIVE TO THE CATHODE EMITTING SURFACE AND SPACED A PREDETERMINED SMALL DISTANCE FROM SAID CATHODE SAID DISTANCE BEING LESS THAN SAID PREDETERMINED THICKNESS OF SAID PLANAR PORTION, THE IMPROVEMENT WHICH COMPRISES: AN INSULATIVE LAYER SANDWICHED BETWEEN AND IN CONTACT WITH SAID CATHODE CAP PORTION AND SAID CONTROL ELECTRODE PLANAR PORTION AND HAVING A CENTRAL APERTURE COAXIALLY ALIGNED WITH SAID CONTROL ELECTRODE APERTURE WHICH APERTURE EFFECTIVELY HAS A DIAMETER EQUAL TO AT LEAST
Claim 2
Dependent Claim
115 words
IN A CATHODE-RAY TUBE INCLUDING A CATHODE HAVING A CAP PORTION WITH ELECTRON EMISSIVE MATERIAL DEPOSITE THEREON AND A CONTROL ELECTRODE INCLUDING A PLANAR PORTION OF A PREDETERMINED THICKNESS ORIENTED SUBSTANTIALLY PARALLEL TO SAID CAP PORTION, SAID PLANAR PORTION HAVING AN APERTURE SMALL RELATIVE TO THE CATHODE EMITTING SURFACE AND SPACED A PREDETERMINED SMALL DISTANCE FROM SAID CATHODE SAID DISTANCE BEING LESS THAN SAID PREDETERMINED THICKNESS OF SAID PLANAR PORTION, THE IMPROVEMENT WHICH COMPRISES: AN INSULATIVE LAYER SANDWICHED BETWEEN AND IN CONTACT WITH SAID CATHODE CAP PORTION AND SAID CONTROL ELECTRODE PLANAR PORTION AND HAVING A CENTRAL APERTURE COAXIALLY ALIGNED WITH SAID CONTROL ELECTRODE APERTURE WHICH APERTURE EFFECTIVELY HAS A DIAMETER EQUAL TO AT LEAST
Claim 3
Dependent Claim
51 words
05 TIMES THE DIAMETER OF SAID CONTROL ELECTRODE APERTURE, BUT LESS THAN THE DIAMETER OF SAID CAP PORTION FOR ACCURATELY AND STABLY POSITIONING SAID CATHODE SAID PREDETERMINED DISTANCE FROM SAID CONTROL ELECTRODE WHILE PREVENTING SUBSTANTIAL ACCUMULATION OF ELECTRIC CHARGE ON SAID INSULATIVE LAYER IN THE REGION OF SAID CONTROL ELECTRODE APERTURE.
Claim 4
Dependent Claim
51 words
05 TIMES THE DIAMETER OF SAID CONTROL ELECTRODE APERTURE, BUT LESS THAN THE DIAMETER OF SAID CAP PORTION FOR ACCURATELY AND STABLY POSITIONING SAID CATHODE SAID PREDETERMINED DISTANCE FROM SAID CONTROL ELECTRODE WHILE PREVENTING SUBSTANTIAL ACCUMULATION OF ELECTRIC CHARGE ON SAID INSULATIVE LAYER IN THE REGION OF SAID CONTROL ELECTRODE APERTURE.
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) | 1969-10-10 | 1970-04-11 | 1970-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-10 | 1974-04-11 | 1974-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-10 | 1978-04-11 | 1978-10-11 | $7700.00 | Window Closed / Lapsed |