US2416273A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Waste heat economizer
Assignee: Petro-Chem Process Co Inc
•
Filing: 1944-04-29
•
Granted: 1947-02-18
•
Expires: 1964-04-29
Abstract
No abstract record available.
Inventors
- 👤 John S Wallis
- 👤 John W Throckmorton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:45
CPC Classifications
F; F22; F22D; F22D1/00; F22D1/02; F22D1/08; Y; Y10; Y10S; Y10S165/00; Y10S165/355; Y10S165/40; Y10S165/401; Y10S165/405
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE455710C
Cited
US1884777A
Cited
US2081970A
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US1989612A
Cited
US1920800A
Cited
US2276529A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-02-17 | 1950-08-19 | 1951-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-02-17 | 1954-08-19 | 1955-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-02-17 | 1958-08-19 | 1959-02-18 | $7700.00 | Window Closed / Lapsed |