US3341704A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for investigating work function distribution and field distribution of a surface by electron beam scanning
Assignee: Individual
•
Filing: 1966-02-07
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Granted: 1967-09-12
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Expires: 1986-02-07
Abstract
No abstract record available.
Inventors
- 👤 Richard E Thomas
- 👤 George A Haas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:02
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/002; G01N27/005
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
135 words
A SYSTEM FOR INVESTIGATING WORK FUNCTION DISTRIBUTION OF A SURFACE COMPRISING: SCANNING MEANS FOR SCANNING THE SURFACE TO BE INVESTIGATED WITH AN ELECTRON BEAM, SIGNAL GENERATOR MEANS COUPLED TO SAID SCANNING MEANS FOR PERIODICALLY CONTINUOUSLY INCREASING THE ENERGY OF SAID ELECTRON BEAM, VARIABLE BIASING MEANS OPERATIVELY COUPLED TO SELECTIVELY BIAS SAID SIGNAL GENERATOR, SIGNAL DEVELOPING MEANS COUPLED TO SAID SURFACE FOR DEVELOPING A SIGNAL PROPORTIONAL TO THE AMOUNT OF ELECTRONS RECEIVED BY SAID SURFACE, SWEEPING MEANS FOR CONTROLLING SAID ELECTRON BEAM, STEPPING MEANS COUPLED BETWEEN SAID SWEEPING MEANS AND SAID SCANNING MEANS FOR STOPPING THE ELECTRON BEAM ON SUCCESSIVE REGIONS OF SAID SURFACE FOR A PREDETERMINED TIME, THRESHOLD MEANS FOR MONITORING THE SIGNAL PRODUCED BY SAID SIGNAL DEVELOPING MEANS AND FOR PRODUCING A THRESHOLD PULSE WHEN A PREDETERMINED AMPLITUDE OF SAID SIGNAL HAS BEEN REACHED,
Claim 2
Independent Claim
135 words
A SYSTEM FOR INVESTIGATING WORK FUNCTION DISTRIBUTION OF A SURFACE COMPRISING: SCANNING MEANS FOR SCANNING THE SURFACE TO BE INVESTIGATED WITH AN ELECTRON BEAM, SIGNAL GENERATOR MEANS COUPLED TO SAID SCANNING MEANS FOR PERIODICALLY CONTINUOUSLY INCREASING THE ENERGY OF SAID ELECTRON BEAM, VARIABLE BIASING MEANS OPERATIVELY COUPLED TO SELECTIVELY BIAS SAID SIGNAL GENERATOR, SIGNAL DEVELOPING MEANS COUPLED TO SAID SURFACE FOR DEVELOPING A SIGNAL PROPORTIONAL TO THE AMOUNT OF ELECTRONS RECEIVED BY SAID SURFACE, SWEEPING MEANS FOR CONTROLLING SAID ELECTRON BEAM, STEPPING MEANS COUPLED BETWEEN SAID SWEEPING MEANS AND SAID SCANNING MEANS FOR STOPPING THE ELECTRON BEAM ON SUCCESSIVE REGIONS OF SAID SURFACE FOR A PREDETERMINED TIME, THRESHOLD MEANS FOR MONITORING THE SIGNAL PRODUCED BY SAID SIGNAL DEVELOPING MEANS AND FOR PRODUCING A THRESHOLD PULSE WHEN A PREDETERMINED AMPLITUDE OF SAID SIGNAL HAS BEEN REACHED,
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) | 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 |