Patent US1136987A successfully refreshed from Google Patents.
US1136987A
Expired / Lapsed
US
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Impact rotary drill.
Assignee: Individual
•
Filing: 1913-06-16
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Granted: 1915-04-27
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Expires: 1933-06-16
Abstract
No abstract record available.
Inventors
- 👤 William Henry Wakfer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:45
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/46; E21B10/58; Y; Y10; Y10T; Y10T279/00; Y10T279/17; Y10T279/17923; Y10T279/17957; Y10T279/17965; Y10T403/00; Y10T403/57; Y10T403/5741; Y10T403/70; Y10T403/7018
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) | 1918-04-26 | 1918-10-26 | 1919-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1922-04-26 | 1922-10-26 | 1923-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1926-04-26 | 1926-10-26 | 1927-04-27 | $7700.00 | Window Closed / Lapsed |