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US2990025A
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Assignee: Dresser Industries Inc
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Filing: 1958-06-16
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Granted: 1961-06-27
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Expires: 1978-06-16
Abstract
No abstract record available.
Inventors
- 👤 Milton L Talbert
- 👤 William E Scarborough
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:48
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/08; E21B10/16; E21B10/46; E21B10/50; E21B10/52
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) | 1964-06-26 | 1964-12-26 | 1965-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-26 | 1968-12-26 | 1969-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-26 | 1972-12-26 | 1973-06-27 | $7700.00 | Window Closed / Lapsed |