Patent US1920584A successfully refreshed from Google Patents.
Patent US3274789A successfully refreshed from Google Patents.
US3274789A
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Process for removing congealed impurities from a gas expander
Assignee: Airco Inc
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Filing: 1965-03-26
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Granted: 1966-09-27
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Expires: 1985-03-26
Abstract
No abstract record available.
Inventors
- 👤 Harold C Mitchell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:40
CPC Classifications
F; F25; F25B; F25B9/00; F25B9/06; F25B43/00; F25B2400/00; F25B2400/14; F25B2400/141
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
58 words
THE METHOD OF REMOVING CONGEALED MATTER FROM THE INTERIOR OF A GAS ENGINE OPERATING NORMALLY AS AN EXPANDER, COMPRISING THE STEPS OF OPERATING THE ENGINE FOR A PERIOD OF TIME AS A COMPRESSOR, AND FEEDING A DRY, INERT GAS THROUGH THE ENGINE TO COMPRESS AND WARM THE DRY, INERT GAS, WHEREBY THE SAID DRY, INERT GAS IS ENABLED
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-09-26 | 1970-03-28 | 1970-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-26 | 1974-03-28 | 1974-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-26 | 1978-03-28 | 1978-09-27 | $7700.00 | Window Closed / Lapsed |