US2355858A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for determining the relative porosity of various porous materials
Assignee: Goodrich Corp
•
Filing: 1941-10-17
•
Granted: 1944-08-15
•
Expires: 1961-10-17
Abstract
No abstract record available.
Inventors
- 👤 Stuart H Hahn
- 👤 Robert H Judson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:13
CPC Classifications
G; G01; G01N; G01N15/00; G01N15/08; G01N15/082; G01N15/0826
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1947-08-15 | 1948-02-14 | 1948-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1951-08-15 | 1952-02-14 | 1952-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1955-08-15 | 1956-02-14 | 1956-08-15 | $7700.00 | Window Closed / Lapsed |