US2521985A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of making fibrous units
Assignee: American Felt Co
•
Filing: 1948-09-16
•
Granted: 1950-09-12
•
Expires: 1968-09-16
Abstract
No abstract record available.
Inventors
- 👤 Philip H Lang
- 👤 William H Lehmberg
- 👤 Charles M Foggett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:47
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/14; B01D39/16; B01D39/18; Y; Y10; Y10S; Y10S297/00; Y10S297/01; Y10S297/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2043809A
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US2184140A
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US2437689A
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US2369658A
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US2378642A
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US2425388A
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US2464301A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-09-11 | 1954-03-13 | 1954-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-09-11 | 1958-03-13 | 1958-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-09-11 | 1962-03-13 | 1962-09-12 | $7700.00 | Window Closed / Lapsed |