Patent US2774575A successfully refreshed from Google Patents.
US2774575A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Regenerator
Assignee: Worthington Corp
•
Filing: 1952-03-07
•
Granted: 1956-12-18
•
Expires: 1972-03-07
Abstract
No abstract record available.
Inventors
- 👤 Walter Hellmuth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:07
CPC Classifications
F; F28; F28F; F28F9/00; F28F9/22; F28D; F28D7/00; F28D7/06; F28F9/007; F28F9/013; F28F9/0137; F28F9/02; F28F9/04; F28F9/16; F28F9/165; F28F9/167; Y; Y10; Y10S; Y10S165/00; Y10S165/051; Y10S165/052; Y10S165/07; Y10S165/91
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US724511A
Cited
US722628A
Cited
GB191115890A
Cited
US1524595A
Cited
US1862310A
Cited
GB375989A
Cited
US1960770A
Cited
US1922173A
Cited
US2336832A
Cited
US2365878A
Cited
CH228297A
Cited
US2596195A
Cited
US2576309A
Cited
US2658729A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-12-18 | 1960-06-18 | 1960-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-18 | 1964-06-18 | 1964-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-18 | 1968-06-18 | 1968-12-18 | $7700.00 | Window Closed / Lapsed |