US2474201A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making microporous sheet material
Assignee: American Felt Co
•
Filing: 1945-07-04
•
Granted: 1949-06-21
•
Expires: 1965-07-04
Abstract
No abstract record available.
Inventors
- 👤 James J Raymond
- 👤 William H Lehmberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:28
CPC Classifications
D; D04; D04H; D04H1/00; D04H1/40; D04H1/58; D04H1/64; D04H1/42; D04H1/4266; Y; Y10; Y10S; Y10S264/00; Y10S264/44; Y10S36/00; Y10S36/02; Y10S425/00; Y10S425/012
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2353877A
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US2355598A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-06-20 | 1952-12-20 | 1953-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-06-20 | 1956-12-20 | 1957-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-06-20 | 1960-12-20 | 1961-06-21 | $7700.00 | Window Closed / Lapsed |