Patent US4222873A successfully refreshed from Google Patents.
US2564100A
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US
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Hot gas apparatus including a regenerator
Assignee: Hartford National Bank and Trust Co
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Filing: 1947-08-07
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Granted: 1951-08-14
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Expires: 1967-08-07
Abstract
No abstract record available.
Inventors
- 👤 Pre Frits Karel Du
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:58
CPC Classifications
F; F02; F02G; F02G1/00; F02G1/04; F02G1/043; F02G1/053; F02G1/057
Claims Analysis
Total Claims: 0
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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) | 1954-08-13 | 1955-02-12 | 1955-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-08-13 | 1959-02-12 | 1959-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-08-13 | 1963-02-12 | 1963-08-14 | $7700.00 | Window Closed / Lapsed |