US2954470A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mass spectrometer and method
Assignee: Phillips Petroleum Co
•
Filing: 1957-04-12
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Granted: 1960-09-27
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Expires: 1977-04-12
Abstract
No abstract record available.
Inventors
- 👤 Roy T Brashear
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:36
CPC Classifications
H; H01; H01J; H01J49/00; H01J49/26; H01J49/34; H01J49/36
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2712073A
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US2435572A
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US2784318A
Cited
US2511981A
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US2522259A
Cited
US2721271A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-09-27 | 1964-03-28 | 1964-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-09-27 | 1968-03-28 | 1968-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-09-27 | 1972-03-28 | 1972-09-27 | $7700.00 | Window Closed / Lapsed |