Patent US2986139A successfully refreshed from Google Patents.
US2986139A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heater for gaseous working mediums of thermal power plants
Assignee: KOHLENSCHELDUNGS GmbH
•
Filing: 1954-06-10
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Granted: 1961-05-30
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Expires: 1974-06-10
Abstract
No abstract record available.
Inventors
- 👤 Nickel Eberhard
- 👤 Geissler Theodor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:46
CPC Classifications
F; F22; F22B; F22B37/00; F22B37/02; F22B37/10; F22B37/14; F22G; F22G1/00; F22G1/16; F28; F28D; F28D7/00; F28D7/08
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-05-29 | 1964-11-28 | 1965-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-29 | 1968-11-28 | 1969-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-29 | 1972-11-28 | 1973-05-30 | $7700.00 | Window Closed / Lapsed |