US3191028A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Scanning electron microscope
Assignee: Individual
•
Filing: 1963-04-22
•
Granted: 1965-06-22
•
Expires: 1983-04-22
Abstract
No abstract record available.
Inventors
- 👤 Albert V Crewe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:04
CPC Classifications
H; H01; H01J; H01J37/00; H01J37/252; H01J37/256; H01J37/02; H01J37/04; H01J37/10; H01J37/14; H01J37/141; H01J37/147; H01J37/15
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
A SCANNING ELECTRON MICROSCOPE COMPRISING FIELD EMISSION ELECTRON SOURCE MEANS FOR GENERATING A NARROW BEAM OF MONOENERGETIC ELECTRONS, MEANS FOR MOUNTING A SPECIMEN, MEANS FOR FOCUSING SAID ELECTRON BEAM INTO A SPOT APPROXIMATELY 10-100 A. IN DIAMETER ON SAID SPECIMEN, MEANS FOR SCANNING SAID FOCUSED ELECTRON SPOT OVER THE SURFACE OF SAID SPECIMEN, MEANS FOR SEPARATING ELECTRONS TRANSMITTED THROUGH SAID SPECIMEN INTO DISCRETE ENERGY LEVELS THEREOF, MEANS FOR DETECTING SAID SEPARATED ELECTRONS AT A DISCRETE ENERGY LEVEL THEREOF, A CATHODE RAY TUBE, MEANS FOR SYNCHRONIZING THE X AND Y AXIS SWEEPS OF SAID CATHODE RAY TUBE WITH THE SCAN OF SAID ELECTRON SPOT, AND MEANS FOR CONNECTING THE OUTPUT OF SAID DETECTING MEANS TO SAID CATHODE RAY TUBE WHEREBY THE DISPLAY INTENSITY THEREOF IS RESPONSIVE TO THE OUTPUT OF SAID DETECTING MEANS.
Claim 2
Dependent Claim
132 words
A SCANNING ELECTRON MICROSCOPE COMPRISING FIELD EMISSION ELECTRON SOURCE MEANS FOR GENERATING A NARROW BEAM OF MONOENERGETIC ELECTRONS, MEANS FOR MOUNTING A SPECIMEN, MEANS FOR FOCUSING SAID ELECTRON BEAM INTO A SPOT APPROXIMATELY 10-100 A. IN DIAMETER ON SAID SPECIMEN, MEANS FOR SCANNING SAID FOCUSED ELECTRON SPOT OVER THE SURFACE OF SAID SPECIMEN, MEANS FOR SEPARATING ELECTRONS TRANSMITTED THROUGH SAID SPECIMEN INTO DISCRETE ENERGY LEVELS THEREOF, MEANS FOR DETECTING SAID SEPARATED ELECTRONS AT A DISCRETE ENERGY LEVEL THEREOF, A CATHODE RAY TUBE, MEANS FOR SYNCHRONIZING THE X AND Y AXIS SWEEPS OF SAID CATHODE RAY TUBE WITH THE SCAN OF SAID ELECTRON SPOT, AND MEANS FOR CONNECTING THE OUTPUT OF SAID DETECTING MEANS TO SAID CATHODE RAY TUBE WHEREBY THE DISPLAY INTENSITY THEREOF IS RESPONSIVE TO THE OUTPUT OF SAID DETECTING MEANS.
References Cited (Backward Citations)
US3103584A
Cited
US2257774A
Cited
US2372422A
Cited
US2418317A
Cited
US2447260A
Cited
US2444700A
Cited
US3028491A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-06-21 | 1968-12-21 | 1969-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-06-21 | 1972-12-21 | 1973-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-06-21 | 1976-12-21 | 1977-06-22 | $7700.00 | Window Closed / Lapsed |