Patent US2773720A successfully refreshed from Google Patents.
US2773720A
Expired / Lapsed
US
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Steam valve with cleaning feature
Assignee: Kopparfors AB
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Filing: 1953-06-23
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Granted: 1956-12-11
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Expires: 1973-06-23
Abstract
No abstract record available.
Inventors
- 👤 Palm Carl Kristian Filip
- 👤 Nylof Erik Herbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:51
CPC Classifications
D; D21; D21C; D21C11/00; D21C11/10; F; F16; F16K; F16K29/00; Y; Y10; Y10T; Y10T137/00; Y10T137/4238; Y10T137/4245; Y10T137/4273; Y10T137/4336
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-12-11 | 1960-06-11 | 1960-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-11 | 1964-06-11 | 1964-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-11 | 1968-06-11 | 1968-12-11 | $7700.00 | Window Closed / Lapsed |