US1887172A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combined earth boring machine and derrick apparatus
Assignee: AT&T Inc
•
Filing: 1932-07-02
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Granted: 1932-11-08
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Expires: 1952-07-02
Abstract
No abstract record available.
Inventors
- 👤 Smith Temple Clifford
- 👤 Spowart John Beveridge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:26
CPC Classifications
E; E21; E21B; E21B3/00; E21B3/02; E21B7/00; E21B7/02; E21B7/021; Y; Y10; Y10T; Y10T74/00; Y10T74/17; Y10T74/177
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) | 1935-11-08 | 1936-05-09 | 1936-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-11-08 | 1940-05-09 | 1940-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-11-08 | 1944-05-09 | 1944-11-08 | $7700.00 | Window Closed / Lapsed |