US3473876A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portable filter evaluation device
Assignee: SAMUEL B STEINBERG
•
Filing: 1967-09-13
•
Granted: 1969-10-21
•
Expires: 1987-09-13
Abstract
No abstract record available.
Inventors
- 👤 Samuel B Steinberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:17
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/47; G01N21/49; G01N21/53; G01N21/534
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2072872A
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US2406409A
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US2513283A
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US2638688A
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US2819608A
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US2966092A
Cited
US3354772A
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US3248551A
Cited
US3328588A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-20 | 1973-04-21 | 1973-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-20 | 1977-04-21 | 1977-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-20 | 1981-04-21 | 1981-10-21 | $7700.00 | Window Closed / Lapsed |