US2636933A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control system responsive to presence of magnetic materials
Assignee: Allis Chalmers Corp
•
Filing: 1949-11-21
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Granted: 1953-04-28
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Expires: 1969-11-21
Abstract
No abstract record available.
Inventors
- 👤 Emil A Lecher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:01
CPC Classifications
G; G01; G01V; G01V3/00; G01V3/08; B; B65; B65H; B65H31/00; B65H31/04; B65H31/12; B65H31/16; B65H43/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US970951A
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US2044152A
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US1639851A
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US1800126A
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US1870840A
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GB457540A
Cited
US2245834A
Cited
US2234982A
Cited
US2322851A
Cited
US2406489A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-04-27 | 1956-10-27 | 1957-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-04-27 | 1960-10-27 | 1961-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-04-27 | 1964-10-27 | 1965-04-28 | $7700.00 | Window Closed / Lapsed |