US2920874A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Steam generator construction
Assignee: Griscom Russell Co
•
Filing: 1955-06-22
•
Granted: 1960-01-12
•
Expires: 1975-06-22
Abstract
No abstract record available.
Inventors
- 👤 Karl A Gardner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 00:00
CPC Classifications
F; F22; F22D; F22D1/00; F22D1/02; F22B; F22B21/00; F22B21/22; F22B21/30; F22G; F22G7/00; F22G7/14
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
DE481998C
Cited
US686313A
Cited
FR672293A
Cited
US1802413A
Cited
US1879453A
Cited
US2065708A
Cited
US2239685A
Cited
US2337624A
Cited
US2457022A
Cited
US2743089A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-11 | 1963-07-13 | 1964-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-11 | 1967-07-13 | 1968-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-11 | 1971-07-13 | 1972-01-12 | $7700.00 | Window Closed / Lapsed |