Patent US2678192A successfully refreshed from Google Patents.
US2678192A
Expired / Lapsed
US
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Rotary transmission head
Assignee: Individual
•
Filing: 1951-02-23
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Granted: 1954-05-11
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Expires: 1971-02-23
Abstract
No abstract record available.
Inventors
- 👤 Nubern P Ledbetter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:46
CPC Classifications
E; E21; E21B; E21B3/00; E21B3/02; E21B3/04; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19642; Y10T74/1966; Y10T74/19665
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1639337A
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US2067921A
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US2171176A
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US2221176A
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US2169264A
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US2276561A
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US2286593A
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US2346958A
Cited
US2390601A
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US2564119A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-05-10 | 1957-11-09 | 1958-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-10 | 1961-11-09 | 1962-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-10 | 1965-11-09 | 1966-05-11 | $7700.00 | Window Closed / Lapsed |