US2667343A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat transfer checker work and unit shapes therefor
Assignee: Unifrax I LLC
•
Filing: 1950-07-22
•
Granted: 1954-01-26
•
Expires: 1970-07-22
Abstract
No abstract record available.
Inventors
- 👤 John P Swentzel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:30
CPC Classifications
C; C10; C10G; C10G9/00; C10G9/14; C10G9/18; Y; Y10; Y10S; Y10S165/00; Y10S165/009; Y10S165/03
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB139880A
Cited
US1496036A
Cited
GB289282A
Cited
FR694430A
Cited
US1973851A
Cited
US1951047A
Cited
GB431309A
Cited
US2532112A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-01-25 | 1957-07-27 | 1958-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-25 | 1961-07-27 | 1962-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-25 | 1965-07-27 | 1966-01-26 | $7700.00 | Window Closed / Lapsed |