US2799156A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for testing coated porous material
Assignee: BF Perkins and Son Inc
•
Filing: 1955-04-11
•
Granted: 1957-07-16
•
Expires: 1975-04-11
Abstract
No abstract record available.
Inventors
- 👤 Jr Charles A Southwick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 02:18
CPC Classifications
G; G01; G01N; G01N19/00; G01N19/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1116118A
Cited
US2340733A
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US2398051A
Cited
US2574475A
Cited
US2679753A
Cited
US2667782A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-07-15 | 1961-01-14 | 1961-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-15 | 1965-01-14 | 1965-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-15 | 1969-01-14 | 1969-07-16 | $7700.00 | Window Closed / Lapsed |