US2856905A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat generating and exchanging device
Assignee: Oxy Catalyst Inc
•
Filing: 1955-04-04
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Granted: 1958-10-21
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Expires: 1975-04-04
Abstract
No abstract record available.
Inventors
- 👤 Iii William M Bowen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:35
CPC Classifications
F; F22; F22B; F22B37/00; F22B37/02; F22B37/04; F22B31/00; F22B37/10; F28; F28D; F28D7/00; F28D7/08; F28D7/082; F28D7/085; F28D7/087
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) | 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 |