Patent US2433271A successfully refreshed from Google Patents.
US2433271A
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Method of forming parallel glass fiber filter units
Assignee: Owens Corning
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Filing: 1944-05-13
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Granted: 1947-12-23
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Expires: 1964-05-13
Abstract
No abstract record available.
Inventors
- 👤 John A Grant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:43
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/44; B01D29/46; B01D25/00; B01D25/001; B01D35/00; C; C03; C03B; C03B37/00; C03B37/10; C03B37/14; Y; Y10; Y10S; Y10S55/00; Y10S55/37; Y10T; Y10T29/00; Y10T29/49; Y10T29/49787; Y10T29/49789; Y10T29/49798; Y10T29/49826; Y10T29/49861; Y10T29/49863; Y10T29/53; Y10T29/53652
Claims Analysis
Total Claims: 0
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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) | 1950-12-22 | 1951-06-23 | 1951-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-12-22 | 1955-06-23 | 1955-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-12-22 | 1959-06-23 | 1959-12-23 | $7700.00 | Window Closed / Lapsed |