US2622850A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Matrix for heat regenerators
Assignee: Shell Development Co
•
Filing: 1951-02-02
•
Granted: 1952-12-23
•
Expires: 1971-02-02
Abstract
No abstract record available.
Inventors
- 👤 Tipler William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:58
CPC Classifications
F; F28; F28D; F28D17/00; F28D17/02; Y; Y10; Y10S; Y10S165/00; Y10S165/009; Y10S165/013; Y10S165/016; Y10S165/029
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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GB614453A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-12-23 | 1956-06-23 | 1956-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-23 | 1960-06-23 | 1960-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-23 | 1964-06-23 | 1964-12-23 | $7700.00 | Window Closed / Lapsed |