Patent US3429291A successfully refreshed from Google Patents.
US3429291A
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Differential-pressure responsive indicator
Assignee: Individual
•
Filing: 1965-02-16
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Granted: 1969-02-25
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Expires: 1985-02-16
Abstract
No abstract record available.
Inventors
- 👤 Leslie J Hoffman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:56
CPC Classifications
B; B22; B22D; B22D27/00; B22D27/09; B22D27/13; G; G01; G01L; G01L13/00; G01L13/02; G01P; G01P13/00; G01P13/0006; G01P13/0013; G01P13/002; H; H01; H01H; H01H35/00; H01H35/24; H01H35/247; H01H35/38
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-02-25 | 1972-08-26 | 1973-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-25 | 1976-08-26 | 1977-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-25 | 1980-08-26 | 1981-02-25 | $7700.00 | Window Closed / Lapsed |