US2848618A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mass spectrometer
Assignee: Phillips Petroleum Co
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Filing: 1955-11-10
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Granted: 1958-08-19
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Expires: 1975-11-10
Abstract
No abstract record available.
Inventors
- 👤 John G Skinner
- 👤 Alvin E Butcher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:24
CPC Classifications
H; H01; H01J; H01J49/00; H01J49/26; H01J49/34; H01J49/36
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
97 words
APPARATUS FOR CONTROLLING THE PASSAGE OF CHARGED PARTICLES COMPRISING A FLAT ANNULAR PLATE HAVING A FIRST FLANGE AT THE INNER EDGE AND A SECOND FLANGE AT THE OUTER EDGE, A METAL SCREEN EXTENDING ACROSS THE OPENING IN SAID PLATE, THE DIAMETER OF SAID SCREEN BEING GREATER THAN THE INNER DIAMETER OF SAID PLATE, A SECOND ANNULAR PLATE OF INNER DIAMETER SUBSTANTIALLY EQUAL THE INNER DIAMETER OF SAID FLAT PLATE, AND MEANS SECURING SAID SECOND PLATE TO SAID FLAT PLATE ON THE SIDE THEREOF OPPOSITE SAID INNER FLANGE, THE EDGE OF SAID SCREEN BEING POSITIONED BETWEEN SAID PLATES.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-08-18 | 1962-02-17 | 1962-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-18 | 1966-02-17 | 1966-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-18 | 1970-02-17 | 1970-08-19 | $7700.00 | Window Closed / Lapsed |