Patent US2129883A successfully refreshed from Google Patents.
Patent US5962933A successfully refreshed from Google Patents.
US5962933A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Computer fan speed control method
Assignee: Round Rock Research LLC
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Filing: 1997-10-01
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Granted: 1999-10-05
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Expires: 2017-10-01
Abstract
Abstract A method of cooling computer components is provided. The method comprises positioning the fan adjacent computer components so that the fan is in a position to blow air over the computer components, connecting the fan to a first voltage source through a zener diode voltage divider, connecting the fan to a first voltage source through a switch, manipulating the switch into a first position wherein a first voltage is applied to the fan thereby inducing the fan to operate at a first speed and manipulating the switch into a second position wherein a second voltage is applied to the fan thereby inducing the fan to operate at a second speed which is less than the first speed.
Inventors
- 👤 Michael G. Henderson
- 👤 Carlton G. Amdahl
- 👤 Dennis H. Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:56
CPC Classifications
G; G06; G06F; G06F13/00; G06F13/38; G06F13/40; G06F13/4004; G06F13/4027; F; F04; F04D; F04D27/00; F04D27/004; G06F11/00; G06F11/07; G06F11/0703; G06F11/0706; G06F11/0748; G06F11/0766; G06F11/0772; G06F11/22; G06F11/2294; G06F11/30; G06F11/3055; G06F11/3058; G06F11/3089; G06F11/32; G06F11/324; G06F11/328; G06F11/34; G06F11/3466; G06F13/4063; G06F13/4068; G06F13/4081; G06F21/00; G06F21/30; G06F21/305; G06F21/31; G06F9/00; G06F9/06; G06F9/44; G06F9/4401; G06F9/4411; H; H02; H02P; H02P7/00; H02P7/06; H02P7/18; H02P7/24; H02P7/28; H02P7/285; H04; H04L; H04L12/00; H04L12/02; H04L12/12; H04L49/00; H04L49/90; H04L67/00; H04L67/01; H04L67/10; H04L67/1001; H05; H05K; H05K7/00; H05K7/20; H05K7/20009; H05K7/20209; G06F11/0793; G06F11/3476; G06F11/3495; G06F2201/00; G06F2201/86; G06F3/00; G06F3/06; G06F3/0601; G06F3/0668; G06F3/0671; G06F3/0673; Y; Y02; Y02B; Y02B30/00; Y02B30/70; Y02D; Y02D30/00; Y02D30/50
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
149 words
A method of controlling the operation of a fan used to cool computer components, the method comprising: positioning the fan adjacent computer components so that the fan is in a position to blow air over the computer components; connecting the fan to a first voltage source through a zener diode voltage divider; connecting the fan to the first voltage source through a switch; manipulating the switch into only one of at least two positions at a time: a first position wherein a first voltage is applied directly to the fan that induces the fan to operate at a first speed, and a second position wherein a second voltage from the zener diode is applied directly to the fan that induces the fan to operate at a second speed which is less than the first speed, wherein if the fan is receiving the first voltage, the zener diode is shorted.
Claim 2
Independent Claim
149 words
A method of controlling the operation of a fan used to cool computer components, the method comprising: positioning the fan adjacent computer components so that the fan is in a position to blow air over the computer components; connecting the fan to a first voltage source through a zener diode voltage divider; connecting the fan to the first voltage source through a switch; manipulating the switch into only one of at least two positions at a time: a first position wherein a first voltage is applied directly to the fan that induces the fan to operate at a first speed, and a second position wherein a second voltage from the zener diode is applied directly to the fan that induces the fan to operate at a second speed which is less than the first speed, wherein if the fan is receiving the first voltage, the zener diode is shorted.
Claim 3
Dependent Claim
78 words
The method of claim 1, wherein the step of connecting the fan to a first voltage source through a voltage divider comprises connecting the fan to the first voltage source through a current independent voltage divider such that the current independent voltage divider reduces the magnitude of the voltage applied to the fan from the first voltage to the second voltage wherein the reduction in magnitude is substantially independent of the current that is drawn by the fan.
Claim 4
Dependent Claim
58 words
The method of claim 2, wherein the step of connecting the fan to the first voltage source through a switch comprises connecting the fan to the voltage source through a P-channel MOSFET that is connected in series between the voltage source and the fan so that the switch is connected in parallel to the zener diode voltage divider.
Claim 5
Dependent Claim
40 words
The method of claim 2, wherein the step of manipulating the switch into the first position results in the switch shorting out the zener diode so that the fan receives substantially the first voltage provided by the first voltage source.
Claim 6
Dependent Claim
46 words
The method of claim 4, wherein the step of manipulating the switch into the second position results in the switch being opened such that the fan receives the second voltage which is equal to the first voltage less the voltage drop provided by the zener diode.
Claim 7
Dependent Claim
27 words
The method of claim 5, wherein the first voltage is substantially equal to 12 volts DC and the second voltage is substantially equal to 8.7 volts DC.
Claim 8
Independent Claim
178 words
A method of controlling the operation of a fan used to cool computer components, the method comprising: positioning the fan adjacent computer components so that the fan is in a position to blow air over the computer components; connecting the fan to a first voltage source through a zener diode voltage divider so that the voltage received by the fan from the first voltage source is reduced by the zener diode voltage divider and wherein the magnitude of the reduction is substantially independent of the current that is drawn by the fan; connecting the fan to the first voltage source through a switch; manipulating the switch into a first position wherein a first voltage is applied to the fan that induces the fan to operate at a first speed; and manipulating the switch into a second position wherein a second voltage is applied to the fan that induces the fan to operate at a second speed which is less than the first speed, wherein only one of the first and the second voltages is enabled at one time.
Claim 9
Independent Claim
178 words
A method of controlling the operation of a fan used to cool computer components, the method comprising: positioning the fan adjacent computer components so that the fan is in a position to blow air over the computer components; connecting the fan to a first voltage source through a zener diode voltage divider so that the voltage received by the fan from the first voltage source is reduced by the zener diode voltage divider and wherein the magnitude of the reduction is substantially independent of the current that is drawn by the fan; connecting the fan to the first voltage source through a switch; manipulating the switch into a first position wherein a first voltage is applied to the fan that induces the fan to operate at a first speed; and manipulating the switch into a second position wherein a second voltage is applied to the fan that induces the fan to operate at a second speed which is less than the first speed, wherein only one of the first and the second voltages is enabled at one time.
Claim 10
Dependent Claim
58 words
The method of claim 7, wherein the step of connecting the fan to the first voltage source through a switch comprises connecting the fan to the voltage source through a P-channel MOSFET that is connected in series between the voltage source and the fan so that the switch is connected in parallel to the zener diode voltage divider.
Claim 11
Dependent Claim
40 words
The method of claim 7, wherein the step of manipulating the switch into the first position results in the switch shorting out the zener diode so that the fan receives substantially the first voltage provided by the first voltage source.
Claim 12
Dependent Claim
46 words
The method of claim 9, wherein the step of manipulating the switch into the second position results in the switch being opened such that the fan receives the second voltage which is equal to the first voltage less the voltage drop provided by the zener diode.
Claim 13
Dependent Claim
27 words
The method of claim 10, wherein the first voltage is substantially equal to 12 volts DC and the second voltage is substantially equal to 8.7 volts DC.
Claim 14
Independent Claim
146 words
A method of controlling the operation of a fan used to cool computer components, the method comprising: positioning the fan adjacent computer components so that the fan is in a position to blow air over the computer components; connecting the fan to a first voltage source through a zener diode voltage divider; connecting the fan to the first voltage source through a switch; manipulating the switch into a first position wherein a first voltage is applied to the fan that induces the fan to operate at a first speed; and manipulating the switch into a second position wherein a second voltage is applied directly to the fan that induces the fan to operate at a second speed which is less than the first speed, wherein the fan is in electrical contact with only one of the zener diode or the first voltage source at a time.
Claim 15
Independent Claim
146 words
A method of controlling the operation of a fan used to cool computer components, the method comprising: positioning the fan adjacent computer components so that the fan is in a position to blow air over the computer components; connecting the fan to a first voltage source through a zener diode voltage divider; connecting the fan to the first voltage source through a switch; manipulating the switch into a first position wherein a first voltage is applied to the fan that induces the fan to operate at a first speed; and manipulating the switch into a second position wherein a second voltage is applied directly to the fan that induces the fan to operate at a second speed which is less than the first speed, wherein the fan is in electrical contact with only one of the zener diode or the first voltage source at a time.
Claim 16
Dependent Claim
58 words
The method of claim 12, wherein the step of connecting the fan to the first voltage source through a switch comprises connecting the fan to the voltage source through a P-channel MOSFET that is connected in series between the voltage source and the fan so that the switch is connected in parallel to the zener diode voltage divider.
Claim 17
Dependent Claim
40 words
The method of claim 12, wherein the step of manipulating the switch into the first position results in the switch shorting out the zener diode so that the fan receives substantially the first voltage provided by the first voltage source.
Claim 18
Dependent Claim
46 words
The method of claim 14, wherein the step of manipulating the switch into the second position results in the switch being opened such that the fan receives the second voltage which is equal to the first voltage less the voltage drop provided by the zener diode.
Claim 19
Dependent Claim
27 words
The method of claim 15, wherein the first voltage is substantially equal to 12 volts DC and the second voltage is substantially equal to 8.7 volts DC.
References Cited (Backward Citations)
US4449182B1
Cited
US4449182A
Cited
US4835737A
Cited
US4999787A
Cited
US4949245A
Cited
US5210855A
Cited
US5493666A
Cited
US5269011A
Cited
US5272584A
Cited
US5317693A
Cited
US5483419A
Cited
US5386567A
Cited
US5337413A
Cited
US5329625A
Cited
US5493574A
Cited
US5761033A
Cited
US5696970A
Cited
US5802552A
Cited
US5812757A
Cited
US5802393A
Cited
US5588144A
Cited
US5781767A
Cited
US5794035A
Cited
US5781798A
Cited
US5638289A
Cited
US5805834A
Cited
US5517646A
Cited
US5768542A
Cited
US5651006A
Cited
US5579491A
Cited
US5664119A
Cited
US5555510A
Cited
US5564024A
Cited
US5812858A
Cited
US5796981A
Cited
US5790831A
Cited
US5581712A
Cited
US5606672A
Cited
US5754797A
Cited
US5568610A
Cited
US5608876A
Cited
US5726506A
Cited
US5747426A
Cited
US5680288A
Cited
US5615207A
Cited
US5768541A
Cited
US5799036A
Cited
US5644731A
Cited
US5740378A
Cited
US5764968A
Cited
US5809224A
Cited
US5632021A
Cited
US5644470A
Cited
US5652832A
Cited
US5761045A
Cited
US5765198A
Cited
US5798828A
Cited
US5793987A
Cited
US5822547A
Cited
US5802269A
Cited
US5747889A
Cited
US5796185A
Cited
US5784576A
Cited
US5815117A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-10-04 | 2003-04-05 | 2003-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-10-04 | 2007-04-05 | 2007-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-10-04 | 2011-04-05 | 2011-10-05 | $7700.00 | Window Closed / Lapsed |