Patent US3551890A successfully refreshed from Google Patents.
US3551890A
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Electrical communication system for oil field gathering system
Assignee: Pan American Petroleum Corp
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Filing: 1968-08-16
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Granted: 1970-12-29
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Expires: 1988-08-16
Abstract
No abstract record available.
Inventors
- 👤 Daniel Silverman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:26
CPC Classifications
E; E21; E21B; E21B34/00; E21B34/16; E21B33/00; E21B33/02; E21B33/03; E21B33/035; E21B33/0355; E21B43/00; E21B43/01; E21B43/017; E21B47/00; E21B47/12; E21B47/13; H; H04; H04B; H04B13/00; H04B13/02
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) | 1973-12-28 | 1974-06-29 | 1974-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-12-28 | 1978-06-29 | 1978-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-12-28 | 1982-06-29 | 1982-12-29 | $7700.00 | Window Closed / Lapsed |