Patent US4396964A successfully refreshed from Google Patents.
US4396964A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recirculating air system for magnetic disk drive
Assignee: Storage Technology Corp
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Filing: 1980-07-02
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Granted: 1983-08-02
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Expires: 2000-07-02
Abstract
Abstract In a magnetic disk drive unit, air is pumped by the magnetic disks through a closed recirculating air path extending over and under the base plate. The air is pumped through a heat exchanger and an air filter to maintain uniform temperature and cleanliness of the recirculating air. A blower driven from the motor which drives the hub pumps air through the ambient side of the heat exchanger to effect a heat transfer from the enclosure.
Inventors
- 👤 James H. Morehouse
- 👤 Mark A. Swenson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:59
CPC Classifications
G; G11; G11B; G11B33/00; G11B33/14; G11B33/1406; G11B33/1413; G11B33/142; G11B33/1446
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
89 words
A magnetic disk drive comprising: a hollow rotating hub having air vents; a base plate for mounting said hub for rotation thereon; a frame on which said base plate is mounted; an enclosure, said frame and enclosure defining a closed air path over and under said base plate, to the inside of said hub and through the vents therein; a heat exchanger in said air path; a centrifugal blower for circulating cooling air through said heat exchanger; and a drive motor for driving both said blower and said hub.
Claim 2
Dependent Claim
89 words
A magnetic disk drive comprising: a hollow rotating hub having air vents; a base plate for mounting said hub for rotation thereon; a frame on which said base plate is mounted; an enclosure, said frame and enclosure defining a closed air path over and under said base plate, to the inside of said hub and through the vents therein; a heat exchanger in said air path; a centrifugal blower for circulating cooling air through said heat exchanger; and a drive motor for driving both said blower and said hub.
Claim 3
Dependent Claim
21 words
The magnetic disk drive recited in claim 1 further comprising: vented spacer rings for mounting said magnetic disks on said hub.
Claim 4
Dependent Claim
16 words
The magnetic disk drive recited in claim 1 wherein said frame is constructed of structural foam.
Claim 5
Dependent Claim
109 words
A magnetic disk drive comprising: a hollow rotating hub having air vents; a base plate for mounting said hub for rotation thereon; a frame on which said base plate is mounted; an enclosure, said frame and enclosure defining a closed air path over and under said base plate, to the inside of said hub and through the vents therein; a magnetic recording head assembly positioned in said closed air path; a source of pressurized ambient air; and an ambient filter, said pressurized ambient air being connected to said closed air path through said ambient filter so that leakage from said closed air path is replaced by clean ambient air.
Claim 6
Dependent Claim
109 words
A magnetic disk drive comprising: a hollow rotating hub having air vents; a base plate for mounting said hub for rotation thereon; a frame on which said base plate is mounted; an enclosure, said frame and enclosure defining a closed air path over and under said base plate, to the inside of said hub and through the vents therein; a magnetic recording head assembly positioned in said closed air path; a source of pressurized ambient air; and an ambient filter, said pressurized ambient air being connected to said closed air path through said ambient filter so that leakage from said closed air path is replaced by clean ambient air.
Claim 7
Dependent Claim
19 words
The disk drive recited in claim 4, further comprising: a high efficiency air filter in said closed air path.
Claim 8
Dependent Claim
16 words
The disk drive recited in claim 4, further comprising: a heat exchanger in said air path.
Claim 9
Dependent Claim
19 words
The magnetic disk drive recited in claim 6 further comprising: means for circulating cooling air through said heat exchanger.
Claim 10
Dependent Claim
29 words
The magnetic disk drive recited in claim 7 wherein said means for circulating comprises: a centrifugal blower; and a drive motor for driving both said blower and said hub.
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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) | 1986-08-01 | 1987-01-31 | 1987-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-01 | 1991-01-31 | 1991-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-01 | 1995-01-31 | 1995-08-02 | $7700.00 | Window Closed / Lapsed |