Patent US20040004644A1 successfully refreshed from Google Patents.
US2901210A
Expired / Lapsed
US
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Electro-magnetic device
Assignee: Phillips Petroleum Co
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Filing: 1953-06-29
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Granted: 1959-08-25
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Expires: 1973-06-29
Abstract
No abstract record available.
Inventors
- 👤 Glen G Hebard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:37
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/02; F16K31/06; F16K31/0675; F16K31/0679; E; E21; E21B; E21B34/00; E21B34/06; E21B34/066; E21B43/00; E21B43/12; E21B43/121; E21B43/122; E21B43/123; E21B43/1235
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US723119A
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GB219745A
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US1672193A
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US2039300A
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US2445561A
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US2556675A
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US2637343A
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US2693929A
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US2644404A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-24 | 1963-02-23 | 1963-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-24 | 1967-02-23 | 1967-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-24 | 1971-02-23 | 1971-08-25 | $7700.00 | Window Closed / Lapsed |