US2731230A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve structure
Assignee: Penn Controls Inc
•
Filing: 1952-01-12
•
Granted: 1956-01-17
•
Expires: 1972-01-12
Abstract
No abstract record available.
Inventors
- 👤 Schell Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:28
CPC Classifications
F; F23; F23N; F23N5/00; F23N5/02; F23N5/04; F23N5/045; G; G05; G05D; G05D23/00; G05D23/01; G05D23/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1311815A
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US2608353A
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US1835974A
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US2000542A
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US2118443A
Cited
US2030932A
Cited
US2140451A
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US2027190A
Cited
US2232934A
Cited
US2291504A
Cited
US2547098A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-01-16 | 1959-07-18 | 1960-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-16 | 1963-07-18 | 1964-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-16 | 1967-07-18 | 1968-01-17 | $7700.00 | Window Closed / Lapsed |