Patent US2721065A successfully refreshed from Google Patents.
US2721065A
Expired / Lapsed
US
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Blast furnace pressure regulator
Assignee: Individual
•
Filing: 1952-05-31
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Granted: 1955-10-18
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Expires: 1972-05-31
Abstract
No abstract record available.
Inventors
- 👤 Walter J Ingram
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:36
CPC Classifications
G; G05; G05D; G05D16/00; G05D16/04; G05D16/12; Y; Y10; Y10S; Y10S261/00; Y10S261/09; Y10S55/00; Y10S55/20; Y10S55/34; Y10T; Y10T137/00; Y10T137/4456; Y10T137/4643; Y10T137/4658; Y10T137/8593; Y10T137/86236
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US154350A
Cited
US660346A
Cited
US712368A
Cited
GB190301182A
Cited
DE370219C
Cited
US1562380A
Cited
US2387818A
Cited
US2435898A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-10-17 | 1959-04-18 | 1959-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-17 | 1963-04-18 | 1963-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-17 | 1967-04-18 | 1967-10-18 | $7700.00 | Window Closed / Lapsed |