US2837653A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mass spectrometers
Assignee: Metropolitan Vickers Electrical Co Ltd
•
Filing: 1956-11-30
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Granted: 1958-06-03
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Expires: 1976-11-30
Abstract
No abstract record available.
Inventors
- 👤 Craig Robert Derek
- 👤 Ireland Northern
- 👤 Thompson James Ian Alexander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:41
CPC Classifications
H; H01; H01J; H01J49/00; H01J49/02; H01J49/022
Claims Analysis
Total Claims: 0
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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) | 1961-06-02 | 1961-12-02 | 1962-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-02 | 1965-12-02 | 1966-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-02 | 1969-12-02 | 1970-06-03 | $7700.00 | Window Closed / Lapsed |