US2169683A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Generating mixed fluid heating medium
Assignee: EX LAB Inc
•
Filing: 1938-01-03
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Granted: 1939-08-15
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Expires: 1958-01-03
Abstract
No abstract record available.
Inventors
- 👤 Clayton A Dunham
- 👤 Aubra R Dunham
- 👤 Jr David N Crosthwait
- 👤 Paul D Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:56
CPC Classifications
F; F24; F24D; F24D1/00
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) | 1942-08-14 | 1943-02-13 | 1943-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-08-14 | 1947-02-13 | 1947-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-08-14 | 1951-02-13 | 1951-08-15 | $7700.00 | Window Closed / Lapsed |