Patent US4041346A successfully refreshed from Google Patents.
US4041346A
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Electrochemical generation of field desorption emitters
Assignee: EIDP Inc
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Filing: 1976-05-13
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Granted: 1977-08-09
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Expires: 1996-05-13
Abstract
Abstract An electrochemically generated field desorption emitter for use in mass spectrometry, and a process for forming such an emitter by immersing a metal support, as a first electrode, and a second electrode in an electrolytic liquid mixture having appropriate concentration of a metal compound, and applying a plurality of short duration, electrical pulses between the electrodes. The emitter so formed comprises an elongated metal support having a plurality of metal dendrites extending in a generally radially outwardly direction therefrom.
Inventors
- 👤 Maurice M. Bursey
- 👤 Deborah M. Hinton
- 👤 Martin C. Sammons
- 👤 R. Mark Wightman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:39
CPC Classifications
H; H01; H01J; H01J9/00; H01J49/00; H01J49/02; H01J49/10; H01J49/16; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/1216; Y10T428/12493; Y10T428/12535; Y10T428/12583
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
97 words
A field desorption emitter comprising: two metal rod elements; an insulator which mechanically positions and electrically isolates the two rod elements; a small diameter wire attached to one end of each of said elements; and a coating of a plurality of tree-like metal dendrites electrochemically deposited using a plurality of short duration electrical pulses on said wire in a generally radially outward direction having a length greater than the diameter of said wire, said metal dendrites being formed from a material selected from the group consisting of silver, nickel, cobalt, manganese, rhenium, niobium, tantalum, molybdenum and tungsten.
Claim 2
Dependent Claim
97 words
A field desorption emitter comprising: two metal rod elements; an insulator which mechanically positions and electrically isolates the two rod elements; a small diameter wire attached to one end of each of said elements; and a coating of a plurality of tree-like metal dendrites electrochemically deposited using a plurality of short duration electrical pulses on said wire in a generally radially outward direction having a length greater than the diameter of said wire, said metal dendrites being formed from a material selected from the group consisting of silver, nickel, cobalt, manganese, rhenium, niobium, tantalum, molybdenum and tungsten.
Claim 3
Dependent Claim
15 words
The field desorption source of claim 1 wherein said elongated support is a tungsten wire.
References Cited (Backward Citations)
DE298728C
Cited
US2116927A
Cited
US3323951A
Cited
US3684480A
Cited
US3843335A
Cited
US3801413A
Cited
US3890209A
Cited
US3982148A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-08 | 1981-02-07 | 1981-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-08 | 1985-02-07 | 1985-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-08 | 1989-02-07 | 1989-08-09 | $7700.00 | Window Closed / Lapsed |