US668558A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for effecting exchange of temperature.
Assignee: Individual
•
Filing: 1899-04-13
•
Granted: 1901-02-19
•
Expires: 1919-04-13
Abstract
No abstract record available.
Inventors
- 👤 Frederic Fouche
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:23
CPC Classifications
F; F28; F28D; F28D1/00; F28D1/02; F28D1/04; F28D1/053; F28D1/05308; F28D21/00; F28D2021/0019; F28D2021/0035
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1904-02-19 | 1904-08-20 | 1905-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1908-02-19 | 1908-08-20 | 1909-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1912-02-19 | 1912-08-20 | 1913-02-19 | $7700.00 | Window Closed / Lapsed |