Patent US2728555A successfully refreshed from Google Patents.
US2728555A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portable drill rigs
Assignee: Texas Instruments Inc
•
Filing: 1951-04-06
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Granted: 1955-12-27
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Expires: 1971-04-06
Abstract
No abstract record available.
Inventors
- 👤 Kenneth E Burg
- 👤 Mann Neil Warren
- 👤 Eugene J Toomey
- 👤 Stewart E Vance
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:03
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/02; E21B7/027; E21B7/028
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US693801A
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US853018A
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US970880A
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US1141927A
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US1143019A
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US1527323A
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US1781889A
Cited
US1820519A
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US1894039A
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US2084686A
Cited
US2343517A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-12-26 | 1959-06-27 | 1959-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-12-26 | 1963-06-27 | 1963-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-12-26 | 1967-06-27 | 1967-12-27 | $7700.00 | Window Closed / Lapsed |