US2774384A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger u-tubes
Assignee: Griscom Russell Co
•
Filing: 1953-09-15
•
Granted: 1956-12-18
•
Expires: 1973-09-15
Abstract
No abstract record available.
Inventors
- 👤 Robert M Wallace
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:26
CPC Classifications
F; F28; F28D; F28D7/00; F28D7/06; F28F; F28F21/00; F28F21/08; F28F2225/00; F28F2225/04; F28F2265/00; F28F2265/26; F28F2275/00; F28F2275/12; F28F2275/125; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49361; Y10T29/49428; Y10T29/4944; Y10T29/49826; Y10T29/49861
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US171440A
Cited
US621730A
Cited
US1893034A
Cited
US2063325A
Cited
US2147350A
Cited
US2308307A
Cited
US2386747A
Cited
US2516689A
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 |