US2681208A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sealing means for rotary air preheaters
Assignee: JARVIS C MARBLE
•
Filing: 1948-12-28
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Granted: 1954-06-15
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Expires: 1968-12-28
Abstract
No abstract record available.
Inventors
- 👤 Boestad Gustav Karl William
- 👤 Persson Per Walther Sigvard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:49
CPC Classifications
F; F28; F28D; F28D19/00; F28D19/04; F28D19/047; F16; F16J; F16J15/00; F16J15/54; Y; Y10; Y10S; Y10S165/00; Y10S165/009; Y10S165/013; Y10S165/016; Y10S165/02; Y10S165/024
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) | 1957-06-14 | 1957-12-14 | 1958-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-06-14 | 1961-12-14 | 1962-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-06-14 | 1965-12-14 | 1966-06-15 | $7700.00 | Window Closed / Lapsed |