US4800274A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High resolution atomic force microscope
Assignee: University of California
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Filing: 1987-02-02
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Granted: 1989-01-24
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Expires: 2007-02-02
Abstract
Abstract A high resolution atomic force microscope allows atomic level topographs of conducting and insulating surfaces. The microscope includes a pair of crossed wires mounted on a single piezoelectric tube which not only controls the x-, and y-, positions of the tip as it is scanned across a surface, but which also adjusts the force with which the tip presses against the sample. The amount of the deflection of the wires is detected as a tunneling current between the wires and another electrode.
Inventors
- 👤 Paul K. Hansma
- 👤 Richard Sonnenfeld
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:49
CPC Classifications
G; G01; G01Q; G01Q60/00; G01Q60/24; G01Q60/38; G01Q20/00; Y; Y10; Y10S; Y10S977/00; Y10S977/84; Y10S977/849; Y10S977/86; Y10S977/863
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
89 words
An atomic force microscope to generate topographs of the surface of a sample, comprising: point means for contacting said sample; wire means for suspending said point means; electrode means, disposed adjacent to said wire means, for allowing a tunnelling current to flow between said wire means and said electrode means as said point coarsely adjusting including, in association with said tube means a boss, piezoelectric bending means, mounted to said boss, for moveably supporting said electrode means, and a coupling threadingly engaging said boss and supporting said wire means.
Claim 2
Dependent Claim
89 words
An atomic force microscope to generate topographs of the surface of a sample, comprising: point means for contacting said sample; wire means for suspending said point means; electrode means, disposed adjacent to said wire means, for allowing a tunnelling current to flow between said wire means and said electrode means as said point coarsely adjusting including, in association with said tube means a boss, piezoelectric bending means, mounted to said boss, for moveably supporting said electrode means, and a coupling threadingly engaging said boss and supporting said wire means.
Claim 3
Dependent Claim
35 words
An atomic force microscope as defined in claim 1, wherein said adjustment means further comprises bracket means, attached to said spring means and said wire means, for coupling said spring means to said wire means.
Claim 4
Dependent Claim
42 words
An atomic force microscope as defined in claim 2, wherein said piezoelectric tube further includes: a boss; piezoelectric bending means, mounted to said boss, for movably supporting said electrode means; and a coupling threadingly engaging said boss and supporting said wire means.
References Cited (Backward Citations)
US4343993A
Cited
US4668865A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-01-24 | 1992-07-25 | 1993-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-24 | 1996-07-25 | 1997-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-24 | 2000-07-25 | 2001-01-24 | $7700.00 | Window Closed / Lapsed |