US4662915A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Powder-air separator for use in a powder filling apparatus
Assignee: Nippon Seisen Co Ltd
•
Filing: 1985-07-09
•
Granted: 1987-05-05
•
Expires: 2005-07-09
Abstract
Abstract A powder-air separator with a filter made by sintering short-cut filament-shaped particles or by sintering a mixture of short-cut filament-shaped particles and ordinary atomized round particles.
Inventors
- 👤 Norio Shirai
- 👤 Jotaro Kishimoto
- 👤 Yukihide Noguchi
- 👤 Hideomi Ishibe
- 👤 Kiyoshi Nagai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:40
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/10
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
139 words
A powder-air separator for use in a powder filling apparatus for measuring a predetermined quantity of powder into a vessel by first inhaling powder from a powder supply source into a powder quantity measuring chamber provided in the apparatus and then exhaling the powder into a vessel to be charged with the powder, said powder-air separator comprising: a powder-air separating filter, said filter including sintered fine particles a substantial portion of which consist of short-cut filament-shaped particles having filament diameters not larger than 30 micrometers and aspect ratios of 2 to 50, said powder-air separating filter having a porosity not less than 30% and showing an initial bubble point pressure not lower than 1200 mm-H 2 O; and a hollow cylindrical filter carrier on which said powder-air separating filter is fixed to form said powder-air separator as a whole.
Claim 2
Dependent Claim
139 words
A powder-air separator for use in a powder filling apparatus for measuring a predetermined quantity of powder into a vessel by first inhaling powder from a powder supply source into a powder quantity measuring chamber provided in the apparatus and then exhaling the powder into a vessel to be charged with the powder, said powder-air separator comprising: a powder-air separating filter, said filter including sintered fine particles a substantial portion of which consist of short-cut filament-shaped particles having filament diameters not larger than 30 micrometers and aspect ratios of 2 to 50, said powder-air separating filter having a porosity not less than 30% and showing an initial bubble point pressure not lower than 1200 mm-H 2 O; and a hollow cylindrical filter carrier on which said powder-air separating filter is fixed to form said powder-air separator as a whole.
Claim 3
Dependent Claim
20 words
A powder-air separator as defined in claim 1, wherein said sintered fine particles consist only of said short-cut filament-shaped particles.
Claim 4
Dependent Claim
24 words
A powder-air separator as defined in claim 1, wherein said sintered fine particles include atomized spherical particles having diameters not larger than 500 micrometers.
Claim 5
Dependent Claim
31 words
A powder-air separator as defined in claim 1, wherein said powder-air separating filter and said hollow cylindrical filter carrier are fixed to each other with an air-pervious material laid between them.
Claim 6
Dependent Claim
30 words
A powder-air separator defined in claim 2, wherein said powder-air separating filter and said hollow cylindrical filter carrier are fixed to each other with an air-pervious material laid between them.
Claim 7
Dependent Claim
30 words
A powder-air separator defined in claim 3, wherein said powder-air separating filter and said hollow cylindrical filter carrier are fixed to each other with an air-pervious material laid between them.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-05-04 | 1990-11-03 | 1991-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-04 | 1994-11-03 | 1995-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-04 | 1998-11-03 | 1999-05-05 | $7700.00 | Window Closed / Lapsed |