Patent US2542786A successfully refreshed from Google Patents.
US2542786A
Expired / Lapsed
US
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Diaphragm pump
Assignee: Gaskell and Chambers Ltd
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Filing: 1947-03-28
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Granted: 1951-02-20
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Expires: 1967-03-28
Abstract
No abstract record available.
Inventors
- 👤 Yates John Ernest Neville
- 👤 Dawson Arthur Lionel Brown
- 👤 Meredew George Charles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:01
CPC Classifications
F; F04; F04B; F04B43/00; F04B43/02; F04B43/025; F04B43/026
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
NL19730C
Cited
FR427964A
Cited
GB191214127A
Cited
US1442308A
Cited
GB255427A
Cited
US1871040A
Cited
GB412858A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-02-19 | 1954-08-21 | 1955-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-19 | 1958-08-21 | 1959-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-19 | 1962-08-21 | 1963-02-20 | $7700.00 | Window Closed / Lapsed |