US2687870A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic control device
Assignee: Milwaukee Gas Specialty Co
•
Filing: 1950-09-14
•
Granted: 1954-08-31
•
Expires: 1970-09-14
Abstract
No abstract record available.
Inventors
- 👤 Russell B Matthews
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:21
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/02; F16K31/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US363186A
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US868230A
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US1672193A
Cited
US1979127A
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US2380165A
Cited
US2405370A
Cited
US2458123A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-08-30 | 1958-03-01 | 1958-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-30 | 1962-03-01 | 1962-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-30 | 1966-03-01 | 1966-08-31 | $7700.00 | Window Closed / Lapsed |