Patent US3150256A successfully refreshed from Google Patents.
US3150256A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Column for electron microscopes
Assignee: Philips Electronics and Pharmaceutical Industries Corp
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Filing: 1962-07-05
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Granted: 1964-09-22
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Expires: 1982-07-05
Abstract
No abstract record available.
Inventors
- 👤 Alvar P Wilska
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:32
CPC Classifications
H; H01; H01J; H01J37/00; H01J37/02; H01J37/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
86 words
AN ELECTRON MICROSCOPE COMPRISING: A SOURCE PRODUCING A BEAM OF ELECTRONS TRAVELING ALONG AN AXIS; AN ELECTROMAGNETIC LENS STRUCTURE COMPRISING A COIL OF WIRE SUBSTANTIALLY COAXIAL WITH SAID BEAM AND A HOLLOW TOROIDAL FERROMAGNETIC CORE SUBSTANTIALLY COMPLETELY SURROUNDING SAID COIL AND HAVING A PAIR OF FIELD-DEFINING EDGES FACING SAID AXIS; AND A PLURALITY OF HOLLOW METAL CYLINDERS SPACED ALONG SAID AXIS TO FORM A COLUMN FOR SAID MICROSCOPE, SAID EDGES LYING BETWEEN SAID SOURCE AND SAID CYLINDERS, EACH OF SAID CYLINDERS HAVING A FRUSTO-CONICAL AXIAL BORE
Claim 2
Dependent Claim
86 words
AN ELECTRON MICROSCOPE COMPRISING: A SOURCE PRODUCING A BEAM OF ELECTRONS TRAVELING ALONG AN AXIS; AN ELECTROMAGNETIC LENS STRUCTURE COMPRISING A COIL OF WIRE SUBSTANTIALLY COAXIAL WITH SAID BEAM AND A HOLLOW TOROIDAL FERROMAGNETIC CORE SUBSTANTIALLY COMPLETELY SURROUNDING SAID COIL AND HAVING A PAIR OF FIELD-DEFINING EDGES FACING SAID AXIS; AND A PLURALITY OF HOLLOW METAL CYLINDERS SPACED ALONG SAID AXIS TO FORM A COLUMN FOR SAID MICROSCOPE, SAID EDGES LYING BETWEEN SAID SOURCE AND SAID CYLINDERS, EACH OF SAID CYLINDERS HAVING A FRUSTO-CONICAL AXIAL BORE
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) | 1967-09-22 | 1968-03-23 | 1968-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-22 | 1972-03-23 | 1972-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-22 | 1976-03-23 | 1976-09-22 | $7700.00 | Window Closed / Lapsed |