US2990541A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Monitoring equipment
Assignee: Hagan Chemicals and Controls Inc
•
Filing: 1957-01-22
•
Granted: 1961-06-27
•
Expires: 1977-01-22
Abstract
No abstract record available.
Inventors
- 👤 Gill Joseph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:25
CPC Classifications
H; H03; H03M; H03M1/00; G; G01; G01K; G01K1/00; G01K1/02; G01K1/024; G01R; G01R17/00; G01R17/02; G01R17/04; H03K; H03K29/00; H03M1/06; H03M1/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2681411A
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US2708745A
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US2717994A
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US2787418A
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US2752555A
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US2683807A
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US2808560A
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US2897486A
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US2840806A
Cited
US2845597A
Cited
US2839744A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-26 | 1964-12-26 | 1965-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-26 | 1968-12-26 | 1969-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-26 | 1972-12-26 | 1973-06-27 | $7700.00 | Window Closed / Lapsed |