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Patent US2972716A successfully refreshed from Google Patents.
US2972716A
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Analytical instrument utilizing ionization and selective evaporation
Assignee: Phillips Petroleum Co
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Filing: 1955-07-07
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Granted: 1961-02-21
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Expires: 1975-07-07
Abstract
No abstract record available.
Inventors
- 👤 Thomas D Morgan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:18
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/62; G01N27/64; G01N27/66
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1690056A
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US1716155A
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US2211325A
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US1914883A
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US2265608A
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US2417213A
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US2560952A
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US2576616A
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US2854625A
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US2796555A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-02-21 | 1964-08-22 | 1965-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-02-21 | 1968-08-22 | 1969-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-02-21 | 1972-08-22 | 1973-02-21 | $7700.00 | Window Closed / Lapsed |