Patent US2798531A successfully refreshed from Google Patents.
US2798531A
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Condensed filamentous mat and method and apparatus for making same
Assignee: American Air Filter Co Inc
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Filing: 1953-01-06
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Granted: 1957-07-09
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Expires: 1973-01-06
Abstract
No abstract record available.
Inventors
- 👤 Jr Robert L Jackson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:07
CPC Classifications
D; D04; D04H; D04H3/00; D04H3/02; B; B01; B01D; B01D29/00; B01D29/11; B01D29/111; C; C03; C03B; C03B37/00; C03B37/01; C03B37/02; C03B37/08; C03B37/081; B01D29/13; B01D29/15; B01D29/21; B01D29/216; Y; Y10; Y10S; Y10S242/00; Y10S242/92; Y10T; Y10T428/00; Y10T428/24; Y10T428/24058; Y10T428/24074; Y10T428/24091; Y10T428/24099; Y10T428/24124; Y10T428/24942; Y10T428/24992
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1957979A
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US2081060A
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US2281747A
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US2338722A
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US2477555A
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US2476582A
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US2609320A
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US2546230A
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US2605053A
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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) | 1960-07-08 | 1961-01-07 | 1961-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-08 | 1965-01-07 | 1965-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-08 | 1969-01-07 | 1969-07-09 | $7700.00 | Window Closed / Lapsed |