US3056281A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Porosity testing of papermaker's felt
Assignee: Individual
•
Filing: 1959-01-28
•
Granted: 1962-10-02
•
Expires: 1979-01-28
Abstract
No abstract record available.
Inventors
- 👤 Thomas C Smyth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:15
CPC Classifications
D; D21; D21F; D21F7/00; D21F7/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2350058A
Cited
US2355858A
Cited
US2694911A
Cited
US2909920A
Cited
US2861451A
Cited
US2880609A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-10-01 | 1966-04-02 | 1966-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-10-01 | 1970-04-02 | 1970-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-10-01 | 1974-04-02 | 1974-10-02 | $7700.00 | Window Closed / Lapsed |