Patent US2812767A successfully refreshed from Google Patents.
US2812767A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Absorbent element for filters and the like
Assignee: Akzo Nobel UK PLC
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Filing: 1955-05-17
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Granted: 1957-11-12
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Expires: 1975-05-17
Abstract
No abstract record available.
Inventors
- 👤 Machenry Richard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:45
CPC Classifications
A; A24; A24D; A24D3/00; A24D3/02; A24D3/0204; A24D3/0212; A24D3/022
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
38 words
AN ABSORBENT POROUS FILTER ELEMENT CONSISTING OF A UNIFORM MIXTURE OF BONDED FIBERS COMPRISING CRIMPED NON-ADHESIVE FIBERS, AND ADHESIVE FIBERS, SAID NON-ADHESIVE CRIMPED FIBERS BEING CAPABLE OF PERMANENTLY RETAINING THEIR CRIMP IN EITHER A DRY OR WET CONDITION.
Claim 2
Dependent Claim
38 words
AN ABSORBENT POROUS FILTER ELEMENT CONSISTING OF A UNIFORM MIXTURE OF BONDED FIBERS COMPRISING CRIMPED NON-ADHESIVE FIBERS, AND ADHESIVE FIBERS, SAID NON-ADHESIVE CRIMPED FIBERS BEING CAPABLE OF PERMANENTLY RETAINING THEIR CRIMP IN EITHER A DRY OR WET CONDITION.
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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) | 1960-11-11 | 1961-05-13 | 1961-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-11-11 | 1965-05-13 | 1965-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-11-11 | 1969-05-13 | 1969-11-12 | $7700.00 | Window Closed / Lapsed |