US3201631A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Short focus lens at focal point of long focus lens
Assignee: High Voltage Engineering Corp
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Filing: 1959-01-02
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Granted: 1965-08-17
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Expires: 1979-01-02
Abstract
No abstract record available.
Inventors
- 👤 Alfred J Gale
- 👤 John C Nygard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:12
CPC Classifications
H; H01; H01J; H01J35/00; H01J35/02; H01J35/14; H01J35/147
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
100 words
APPARATUS FOR OBTAINING A FINE FOCAL SPOT COMPRISING AN ALTERNATING GRADIENT MAGNETIC FOCUSING SYSTEM OF RELATIVELY LONG FOCAL LENGTH AND OF RELATIVELY SMALL ANGULAR APERTURE, AND IN COMBINATION THEREWITH AN ALTERNATING GRADIENT FOCUSING SYSTEM OF RELATIVELY SHORT FOCAL LENGTH AND OF LARGER ANGULAR APERTURE, SAID SECOND FOCUSING SYSTEM BEING PLACED IN THE NEIGHBORHOOD OF THE FOCAL POINT OF SAID FIRST FOCUSING SYSTEM, WHEREIN THE TERM "THE FOCAL POINT OF THE FIRST FOCUSING SYSTEM" MEANS THAT POINT AT WHICH THE SPOT SIZE IN THE PLANE OF THE SECOND FOCUSING SYSTEM VARIES SYMMETRICALLY ABOUT A MINIMUM FOR THE MAXIMUM USEFUL ENERGY RANGE.
Claim 2
Dependent Claim
100 words
APPARATUS FOR OBTAINING A FINE FOCAL SPOT COMPRISING AN ALTERNATING GRADIENT MAGNETIC FOCUSING SYSTEM OF RELATIVELY LONG FOCAL LENGTH AND OF RELATIVELY SMALL ANGULAR APERTURE, AND IN COMBINATION THEREWITH AN ALTERNATING GRADIENT FOCUSING SYSTEM OF RELATIVELY SHORT FOCAL LENGTH AND OF LARGER ANGULAR APERTURE, SAID SECOND FOCUSING SYSTEM BEING PLACED IN THE NEIGHBORHOOD OF THE FOCAL POINT OF SAID FIRST FOCUSING SYSTEM, WHEREIN THE TERM "THE FOCAL POINT OF THE FIRST FOCUSING SYSTEM" MEANS THAT POINT AT WHICH THE SPOT SIZE IN THE PLANE OF THE SECOND FOCUSING SYSTEM VARIES SYMMETRICALLY ABOUT A MINIMUM FOR THE MAXIMUM USEFUL ENERGY RANGE.
References Cited (Backward Citations)
US2849634A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-08-16 | 1969-02-15 | 1969-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-16 | 1973-02-15 | 1973-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-16 | 1977-02-15 | 1977-08-17 | $7700.00 | Window Closed / Lapsed |