US3877900A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dust collector
Assignee: Ammco Tools Inc
•
Filing: 1973-12-10
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Granted: 1975-04-15
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Expires: 1993-12-10
Abstract
Abstract A dust collector into which dust laden air is blown under pressure includes an air pervious dust bag sealably mounted over an impervious, disposable bag into which the dust from the bag falls by gravity each time the blower is stopped. The bag is contained in a perforated, bucket-like housing sealably connected over the open bottom of the dust bag.
Inventors
- 👤 Wallace F Mitchell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:28
CPC Classifications
A; A47; A47L; A47L7/00; A47L7/0095; A47L9/00; A47L9/10; A47L9/14; A47L9/1418; B; B01; B01D; B01D46/00; B01D46/02; B24; B24B; B24B55/00; B24B55/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
172 words
A dust collector for use with a grinding machine having an exhaust port through which dust laden air is emitted under pressure, the combination comprising, an air pervious dust bag having an inlet sleeve near the top and an open bottom, means for sealably connecting said sleeve to said exhaust port, a resilient sealing ring fixedly connected to said bag and providing an external flange at the bottom end of said bag. a rigid guard member adapted to be mounted in fixed relationship with said grinding machine and surrounding said dust bag, a ring having a downwardly opening annular groove carried by said guard member near the bottom thereof, said resilient sealing ring being held in said annular groove an open top perforate container, an imperforate flexible bag disposed in said container with the rim portion of said bag overhanging the rim of said container, and latch means securing said container to said guard with an annular portion of said bag compressed between the rim of said container and said resilient ring.
Claim 2
Dependent Claim
172 words
A dust collector for use with a grinding machine having an exhaust port through which dust laden air is emitted under pressure, the combination comprising, an air pervious dust bag having an inlet sleeve near the top and an open bottom, means for sealably connecting said sleeve to said exhaust port, a resilient sealing ring fixedly connected to said bag and providing an external flange at the bottom end of said bag. a rigid guard member adapted to be mounted in fixed relationship with said grinding machine and surrounding said dust bag, a ring having a downwardly opening annular groove carried by said guard member near the bottom thereof, said resilient sealing ring being held in said annular groove an open top perforate container, an imperforate flexible bag disposed in said container with the rim portion of said bag overhanging the rim of said container, and latch means securing said container to said guard with an annular portion of said bag compressed between the rim of said container and said resilient ring.
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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) | 1978-04-14 | 1978-10-14 | 1979-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-14 | 1982-10-14 | 1983-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-14 | 1986-10-14 | 1987-04-15 | $7700.00 | Window Closed / Lapsed |