Patent US2820579A successfully refreshed from Google Patents.
US2820579A
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Combined valve and measuring chamber
Assignee: Pfaudler Inc
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Filing: 1954-02-11
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Granted: 1958-01-21
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Expires: 1974-02-11
Abstract
No abstract record available.
Inventors
- 👤 William F Roth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:52
CPC Classifications
G; G01; G01F; G01F11/00; G01F11/28; G01F11/30; G01F11/32; B; B65; B65B; B65B3/00; B65B3/26; B65B3/30; B65B3/305
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US576241A
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US809439A
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US1456854A
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US2307223A
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US2341950A
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US2463922A
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US2652965A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-20 | 1961-07-22 | 1962-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-20 | 1965-07-22 | 1966-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-20 | 1969-07-22 | 1970-01-21 | $7700.00 | Window Closed / Lapsed |