US2619022A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ventilating chimney
Assignee: Individual
•
Filing: 1950-02-20
•
Granted: 1952-11-25
•
Expires: 1970-02-20
Abstract
No abstract record available.
Inventors
- 👤 Richard G Hergenrother
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:13
CPC Classifications
F; F23; F23J; F23J13/00; F23J13/02; F23J13/025; F23L; F23L15/00; F23L15/04; F23J2211/00; F23J2211/10; F23J2211/101; Y; Y02; Y02E; Y02E20/00; Y02E20/34; Y10; Y10S; Y10S165/00; Y10S165/901
Claims Analysis
Total Claims: 0
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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) | 1955-11-25 | 1956-05-26 | 1956-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-11-25 | 1960-05-26 | 1960-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-11-25 | 1964-05-26 | 1964-11-25 | $7700.00 | Window Closed / Lapsed |