US2680899A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making resilient filter elements and batts
Assignee: Houdaille Hershey Corp
•
Filing: 1948-05-07
•
Granted: 1954-06-15
•
Expires: 1968-05-07
Abstract
No abstract record available.
Inventors
- 👤 Joseph B Sebok
- 👤 Sebok Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:20
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/14; B01D39/16; B01D39/1607; B01D39/1615; B01D2239/00; B01D2239/10; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31725; Y10T428/3175; Y10T428/31754
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US260918A
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US483590A
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US1646605A
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US1906028A
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US2054131A
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FR766983A
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FR771513A
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US2288072A
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US2411660A
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US2455534A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-06-14 | 1957-12-14 | 1958-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-06-14 | 1961-12-14 | 1962-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-06-14 | 1965-12-14 | 1966-06-15 | $7700.00 | Window Closed / Lapsed |