US2767560A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid cooling plant for mines
Assignee: Power Jets Research and Development Ltd
•
Filing: 1952-10-13
•
Granted: 1956-10-23
•
Expires: 1972-10-13
Abstract
No abstract record available.
Inventors
- 👤 Grey John Constantine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:49
CPC Classifications
E; E21; E21F; E21F3/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1440000A
Cited
US1879685A
Cited
US2097723A
Cited
US2210896A
Cited
GB453681A
Cited
DE671044C
Cited
US2479408A
Cited
GB605578A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-10-23 | 1960-04-23 | 1960-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-23 | 1964-04-23 | 1964-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-23 | 1968-04-23 | 1968-10-23 | $7700.00 | Window Closed / Lapsed |