Patent US2452760A successfully refreshed from Google Patents.
US2452760A
Expired / Lapsed
US
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Mining machine
Assignee: Jeffrey Manufacturing Co
•
Filing: 1943-08-10
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Granted: 1948-11-02
•
Expires: 1963-08-10
Abstract
No abstract record available.
Inventors
- 👤 Florence H C Jeffrey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:09
CPC Classifications
E; E21; E21C; E21C35/00; E21C35/04; E21C35/043
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1308844A
Cited
US1312701A
Cited
US690813A
Cited
US1044838A
Cited
US1257776A
Cited
US1407047A
Cited
GB138739A
Cited
US1539616A
Cited
US1918985A
Cited
GB234209A
Cited
US1639255A
Cited
US1748606A
Cited
US1971601A
Cited
US2056896A
Cited
US2114076A
Cited
US2137448A
Cited
US2229086A
Cited
US2080810A
Cited
GB464891A
Cited
US2343386A
Cited
US2136921A
Cited
US2114443A
Cited
US2128064A
Cited
US2177098A
Cited
US2297894A
Cited
US2265314A
Cited
US2214390A
Cited
US2299234A
Cited
US2263779A
Cited
US2239098A
Cited
US2323493A
Cited
US2308451A
Cited
US2334009A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-11-02 | 1952-05-03 | 1952-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-11-02 | 1956-05-03 | 1956-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-11-02 | 1960-05-03 | 1960-11-02 | $7700.00 | Window Closed / Lapsed |