US3142549A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Respirator and a disposable pre-filter
Assignee: C & D ACQUISITION CORP A CORP OF DE
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Filing: 1961-10-31
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Granted: 1964-07-28
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Expires: 1981-10-31
Abstract
No abstract record available.
Inventors
- 👤 Paul A Klusewitz
- 👤 Vernon F Gongoll
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:02
CPC Classifications
A; A62; A62B; A62B23/00; A62B23/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
157 words
IN COMBINATION WITH A RESPIRATOR HAVING AN INHALATION VALVE, A SCREW THREADED CUP ATTACHED TO SAID RESPIRATOR AND HAVING A HOLE IN COMMUNICATION WITH SAID VALVE, A MAIN FILTER CARTRIDGE CONTAINED WITHIN SAID CUP, A CAP SCREW THREADED TO SAID CUP SO AS TO FORM AN AIR-TIGHT SEAL BETWEEN SAID CUP AND CARTRIDGE, SAID CAP BEING OPENED AT THE TOP AND HAVING AN OUTER END PORTION OF REDUCED DIAMETER, A SECOND CAP BEING OPENED AT THE TOP AND HAVING A MOUTH PORTION DETACHABLY FITTED TO SAID PORTION OF REDUCED DIAMETER, A SEALING RING BETWEEN SAID PORTIONS, A FILTER PAD EXTENDING ACROSS AN INNER, INTERMEIATE PORTION OF SAID SECOND CAP, AND A BODY OF LOOSE, FIBROUS FILTERING MATERIAL SUPPORTED BY SAID FILTER PAD TO FORM A PRE-FILTER AND EXTENDING TO THE OUTER END PORTION OF SAID SECOND CAP, WHEREBY SAID SECOND CAP AND THE ENCLOSED PRE-FILTER ARE READILY DISPOSABLE AFTER ABSORBING VAPOR MIST WITHOUT AFFECTING SAID AIR-TIGHT SEAL.
Claim 2
Dependent Claim
157 words
IN COMBINATION WITH A RESPIRATOR HAVING AN INHALATION VALVE, A SCREW THREADED CUP ATTACHED TO SAID RESPIRATOR AND HAVING A HOLE IN COMMUNICATION WITH SAID VALVE, A MAIN FILTER CARTRIDGE CONTAINED WITHIN SAID CUP, A CAP SCREW THREADED TO SAID CUP SO AS TO FORM AN AIR-TIGHT SEAL BETWEEN SAID CUP AND CARTRIDGE, SAID CAP BEING OPENED AT THE TOP AND HAVING AN OUTER END PORTION OF REDUCED DIAMETER, A SECOND CAP BEING OPENED AT THE TOP AND HAVING A MOUTH PORTION DETACHABLY FITTED TO SAID PORTION OF REDUCED DIAMETER, A SEALING RING BETWEEN SAID PORTIONS, A FILTER PAD EXTENDING ACROSS AN INNER, INTERMEIATE PORTION OF SAID SECOND CAP, AND A BODY OF LOOSE, FIBROUS FILTERING MATERIAL SUPPORTED BY SAID FILTER PAD TO FORM A PRE-FILTER AND EXTENDING TO THE OUTER END PORTION OF SAID SECOND CAP, WHEREBY SAID SECOND CAP AND THE ENCLOSED PRE-FILTER ARE READILY DISPOSABLE AFTER ABSORBING VAPOR MIST WITHOUT AFFECTING SAID AIR-TIGHT SEAL.
References Cited (Backward Citations)
GB474823A
Cited
US2062834A
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US2264829A
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US2614830A
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US2652828A
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US2798718A
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US2744523A
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US2787333A
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US2993564A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-07-28 | 1968-01-27 | 1968-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-28 | 1972-01-27 | 1972-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-28 | 1976-01-27 | 1976-07-28 | $7700.00 | Window Closed / Lapsed |