US2857569A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermal converter
Assignee: Daystrom Inc
•
Filing: 1956-04-19
•
Granted: 1958-10-21
•
Expires: 1976-04-19
Abstract
No abstract record available.
Inventors
- 👤 Roswell W Gilbert
- 👤 John H Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:35
CPC Classifications
G; G01; G01R; G01R19/00; G01R19/22; G01R19/225
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2511855A
Cited
US2373241A
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US2434929A
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US2535257A
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US2565922A
Cited
US2702857A
Cited
US2744168A
Cited
US2762975A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-10-20 | 1962-04-21 | 1962-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-20 | 1966-04-21 | 1966-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-20 | 1970-04-21 | 1970-10-21 | $7700.00 | Window Closed / Lapsed |