US2988657A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ion pump
Assignee: US Philips Corp
•
Filing: 1959-07-14
•
Granted: 1961-06-13
•
Expires: 1979-07-14
Abstract
No abstract record available.
Inventors
- 👤 Klopfer Anton Martin
- 👤 Ermrich Winfried Georg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:00
CPC Classifications
H; H01; H01J; H01J41/00; H01J41/12; H01J41/18; H01J41/20; H01J29/00; H01J29/94; H01J41/14; H01J41/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2605431A
Cited
US2758233A
Cited
US2727167A
Cited
US2836790A
Cited
US2790949A
Cited
US2796555A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-12 | 1964-12-12 | 1965-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-12 | 1968-12-12 | 1969-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-12 | 1972-12-12 | 1973-06-13 | $7700.00 | Window Closed / Lapsed |