Patent US2539418A successfully refreshed from Google Patents.
US2539418A
Expired / Lapsed
US
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Apparatus for testing piezoelectric pressure gauges
Assignee: Individual
•
Filing: 1946-02-27
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Granted: 1951-01-30
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Expires: 1966-02-27
Abstract
No abstract record available.
Inventors
- 👤 Charles H Grogan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:01
CPC Classifications
G; G01; G01L; G01L23/00; G01L23/08; G01L23/10; G01L27/00; G01L27/002; G01L27/005
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) | 1954-01-29 | 1954-07-31 | 1955-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-29 | 1958-07-31 | 1959-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-29 | 1962-07-31 | 1963-01-30 | $7700.00 | Window Closed / Lapsed |