US2614655A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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Assignee: Individual
•
Filing: 1943-08-10
•
Granted: 1952-10-21
•
Expires: 1963-08-10
Abstract
No abstract record available.
Inventors
- 👤 Sidney H Katz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:43
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/14; A; A62; A62B; A62B23/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
47 words
A FILTERING MEDIUM COMPRISING. A FILTER PAPER HAVING DISPENSED THEREON AND IN THE PORES THEREOF BY AIR FILTERING A FINELY PULVERIZED ASBESTOS PARTICLE FILTRATE, SAID PAPER COMPRISES A SOFT FUZZY AND POROUS WEB OF CELLULOSE FIBERS, SAID PARTICLES BEING FRICTIONALLY HELD IN SAID FIBERS IN SAID WEB.
Claim 2
Dependent Claim
47 words
A FILTERING MEDIUM COMPRISING. A FILTER PAPER HAVING DISPENSED THEREON AND IN THE PORES THEREOF BY AIR FILTERING A FINELY PULVERIZED ASBESTOS PARTICLE FILTRATE, SAID PAPER COMPRISES A SOFT FUZZY AND POROUS WEB OF CELLULOSE FIBERS, SAID PARTICLES BEING FRICTIONALLY HELD IN SAID FIBERS IN SAID WEB.
References Cited (Backward Citations)
US321947A
Cited
GB191119172A
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US1349112A
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US1798164A
Cited
US2061570A
Cited
US2063990A
Cited
FR851577A
Cited
US2306222A
Cited
US2372437A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-10-21 | 1956-04-21 | 1956-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-10-21 | 1960-04-21 | 1960-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-10-21 | 1964-04-21 | 1964-10-21 | $7700.00 | Window Closed / Lapsed |