US2602838A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical measuring instrument
Assignee: Phillips Petroleum Co
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Filing: 1949-11-25
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Granted: 1952-07-08
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Expires: 1969-11-25
Abstract
No abstract record available.
Inventors
- 👤 Boisblanc Deslonde R De
- 👤 Jr Ross S Marsden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:14
CPC Classifications
G; G01; G01R; G01R27/00; G01R27/02; G01R27/26; G01R27/2688
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-07-08 | 1956-01-07 | 1956-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-07-08 | 1960-01-07 | 1960-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-07-08 | 1964-01-07 | 1964-07-08 | $7700.00 | Window Closed / Lapsed |