Patent US2742269A successfully refreshed from Google Patents.
US2742269A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recuperator
Assignee: REKUPERATOR K G DR ING SCHACK AND CO
•
Filing: 1952-08-12
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Granted: 1956-04-17
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Expires: 1972-08-12
Abstract
No abstract record available.
Inventors
- 👤 Schefels Gerhard
- 👤 Schack Alfred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:01
CPC Classifications
F; F28; F28D; F28D7/00; F28D7/02; F28D7/026; Y; Y10; Y10S; Y10S165/00; Y10S165/051; Y10S165/052; Y10S165/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US650965A
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US1495066A
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US1533156A
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US1812339A
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US1983194A
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US1964256A
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US2344269A
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US2468909A
Cited
US2555322A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-04-17 | 1959-10-17 | 1960-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-17 | 1963-10-17 | 1964-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-17 | 1967-10-17 | 1968-04-17 | $7700.00 | Window Closed / Lapsed |