Patent US3413951A successfully refreshed from Google Patents.
US3413951A
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US
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Differential pressure indicator
Assignee: Holley Performance Products Inc
•
Filing: 1964-06-15
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Granted: 1968-12-03
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Expires: 1984-06-15
Abstract
No abstract record available.
Inventors
- 👤 Leonard W Keil
- 👤 Carl F Schorn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:54
CPC Classifications
B; B01; B01D; B01D35/00; B01D35/14; B01D35/143; H; H01; H01H; H01H35/00; H01H35/24; H01H35/38; H01H36/00; Y; Y10; Y10S; Y10S116/00; Y10S116/42
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) | 1971-12-03 | 1972-06-03 | 1972-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-03 | 1976-06-03 | 1976-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-03 | 1980-06-03 | 1980-12-03 | $7700.00 | Window Closed / Lapsed |