Patent US3541852A successfully refreshed from Google Patents.
US3541852A
Expired / Lapsed
US
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Electronic system for monitoring drilling conditions relating to oil and gas wells
Assignee: Dresser Industries Inc
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Filing: 1968-11-29
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Granted: 1970-11-24
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Expires: 1988-11-29
Abstract
No abstract record available.
Inventors
- 👤 James H Brown
- 👤 William S Young
- 👤 William M Deason
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:27
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/003; E21B47/04
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) | 1973-11-23 | 1974-05-25 | 1974-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-23 | 1978-05-25 | 1978-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-23 | 1982-05-25 | 1982-11-24 | $7700.00 | Window Closed / Lapsed |