Patent US4620102A successfully refreshed from Google Patents.
US4620102A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron-impact type of ion source with double grid anode
Assignee: Seiko Instruments Inc
•
Filing: 1985-03-25
•
Granted: 1986-10-28
•
Expires: 2005-03-25
Abstract
Abstract A double grid anode is characterized in that said anode is comprised of a first cage-like anode made of a metal grid or wire gauze that permits that passage of electrons and that has an open end, a second anode which also consists of a metal grid or wire gauze located at the open end side of said first anode, a hot-cathode filament arranged around the outer periphery of said first anode, and an ion-extraction electrode which faces said anode.
Inventors
- 👤 Fumio Watanabe
- 👤 Yoshiaki Hara
- 👤 Masao Miyamoto
- 👤 Yasuo Kusumoto
- 👤 Syojiro Komaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:13
CPC Classifications
H; H01; H01J; H01J49/00; H01J49/02; H01J49/10; H01J49/14; H01J49/147; H01J27/00; H01J27/02; H01J27/20; H01J27/205
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
109 words
In an electron-impact type of ion source of a three-electrode construction comprising at least a hot-cathode filament, an anode, and an ion-extraction electrode, an electron-impact type of ion source with a double grid anode characterized in that said anode is comprised of a first cage-like anode made of a metal grid or wire gauze that permits the passage of electrons and that has an open end, a second anode which also consists of a metal grid or wire gauze located at the open end side of said first anode, a hot-cathode filament arranged around the outer periphery of said first anode, and an ion-extraction electrode which faces said anode.
Claim 2
Dependent Claim
109 words
In an electron-impact type of ion source of a three-electrode construction comprising at least a hot-cathode filament, an anode, and an ion-extraction electrode, an electron-impact type of ion source with a double grid anode characterized in that said anode is comprised of a first cage-like anode made of a metal grid or wire gauze that permits the passage of electrons and that has an open end, a second anode which also consists of a metal grid or wire gauze located at the open end side of said first anode, a hot-cathode filament arranged around the outer periphery of said first anode, and an ion-extraction electrode which faces said anode.
Claim 3
Dependent Claim
76 words
The electron-impact type of ion source with a double grid anode according to claim 1, wherein said double anode construction is realized by forming said first anode to an approximately hemispherical shape, and arranging the second anode virtually concentric therewith at the open end side of said first anode, said second anode being composed of a metal grid or wire gauze of an approximately hemispherical shape with a curvature smaller than that of said first anode.
References Cited (Backward Citations)
US4272699A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-10-27 | 1990-04-28 | 1990-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-27 | 1994-04-28 | 1994-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-27 | 1998-04-28 | 1998-10-28 | $7700.00 | Window Closed / Lapsed |