Patent US3411477A successfully refreshed from Google Patents.
US3411477A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure differential indicator
Assignee: Marvel Engineering Co
•
Filing: 1967-08-03
•
Granted: 1968-11-19
•
Expires: 1987-08-03
Abstract
No abstract record available.
Inventors
- 👤 Walter J Kudlaty
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:45
CPC Classifications
G; G01; G01L; G01L7/00; G01L7/16
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US462837A
Cited
US1770094A
Cited
US2579120A
Cited
US2597724A
Cited
US2948256A
Cited
US2948151A
Cited
US3066527A
Cited
FR1341608A
Cited
US3208425A
Cited
US3325010A
Cited
US3300769A
Cited
US3358836A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-11-19 | 1972-05-20 | 1972-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-19 | 1976-05-20 | 1976-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-19 | 1980-05-20 | 1980-11-19 | $7700.00 | Window Closed / Lapsed |