US2848871A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low pressure scavenging arrangements of pressure exchangers
Assignee: JENDRASSIK DEVELOPMENTS Ltd
•
Filing: 1953-09-14
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Granted: 1958-08-26
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Expires: 1973-09-14
Abstract
No abstract record available.
Inventors
- 👤 Andre G T Boszormenyi
- 👤 Jendrassik Clara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:55
CPC Classifications
F; F02; F02C; F02C3/00; F02C3/02; F04; F04F; F04F13/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2045152A
Cited
US2399394A
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US2461186A
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FR1020890A
Cited
US2738123A
Cited
US2697593A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-08-25 | 1962-02-24 | 1962-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-25 | 1966-02-24 | 1966-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-25 | 1970-02-24 | 1970-08-26 | $7700.00 | Window Closed / Lapsed |