Patent US2809521A successfully refreshed from Google Patents.
US2809521A
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US
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Diaphragm for gas meters
Assignee: WADDELL Inc
•
Filing: 1954-06-04
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Granted: 1957-10-15
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Expires: 1974-06-04
Abstract
No abstract record available.
Inventors
- 👤 Waddell Homer James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:01
CPC Classifications
F; F16; F16J; F16J3/00; F16J3/02; G; G01; G01F; G01F3/00; G01F3/02; G01F3/20; G01F3/22; G01F3/225
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1096296A
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US1279268A
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US1611105A
Cited
GB239641A
Cited
US1664193A
Cited
US1712697A
Cited
US2275712A
Cited
US2658526A
Cited
US2693701A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-10-14 | 1961-04-15 | 1961-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-14 | 1965-04-15 | 1965-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-14 | 1969-04-15 | 1969-10-15 | $7700.00 | Window Closed / Lapsed |