US5325809A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hair dryer with alarm notifying user of clogged filter
Assignee: Conair LLC
•
Filing: 1993-04-26
•
Granted: 1994-07-05
•
Expires: 2013-04-26
Abstract
Abstract A warning system for a hair dryer to warn the user when the air inlet of the dryer has become clogged with hair or other particles, the dryer including an air filter in the inlet, an air-actuated whistle having an air inlet end and an air outlet end, the whistle being mounted in the air inlet with the air inlet end outside the filter and the air outlet end inside the filter. Air will pass through the whistle when the inlet has become clogged, causing it to blow, and thereby warning the user that the inlet has become clogged. This occurs when the air pressure differential between the two sides of the filter reaches a predetermined level.
Inventors
- 👤 Theodore B. Mulle, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:25
CPC Classifications
A; A45; A45D; A45D20/00; A45D20/04; A45D20/08; A45D20/10; A45D20/12; Y; Y10; Y10S; Y10S116/00; Y10S116/25
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
107 words
A warning system for a hair dryer to warn when the inlet of the dryer has become clogged with hair or other particles, said dryer including a housing having an air inlet and a filter in said air inlet, said system including an air-actuated whistle having an air inlet end and an air outlet end, said whistle being mounted in said filter with said air inlet end outside said housing and said air outlet end inside said housing, whereby air will pass through said whistle when said air inlet has become clogged, causing it to blow, and thereby giving a warning that said inlet has become clogged.
Claim 2
Dependent Claim
107 words
A warning system for a hair dryer to warn when the inlet of the dryer has become clogged with hair or other particles, said dryer including a housing having an air inlet and a filter in said air inlet, said system including an air-actuated whistle having an air inlet end and an air outlet end, said whistle being mounted in said filter with said air inlet end outside said housing and said air outlet end inside said housing, whereby air will pass through said whistle when said air inlet has become clogged, causing it to blow, and thereby giving a warning that said inlet has become clogged.
Claim 3
Dependent Claim
31 words
A warning system as set forth in claim 1 in which said whistle will blow when the air pressure differential between the two sides of said filter reaches a predetermined level.
Claim 4
Dependent Claim
147 words
A warning system formed as part of a hair dryer to provide a warning whenever an air inlet of said hair dryer becomes overly clogged with hair other matter, said system including a dryer housing having an air inlet, an air filter across said air inlet, and means for supporting said air filter, said air filter having an outer side and an inner side inside of said housing, an air actuated whistle mounted in said air filter having a whistle air inlet and a whistle air outlet, said whistle being mounted with said whistle air inlet adjacent said outer side of said air filter and said whistle air outlet adjacent said inner side of said air filter, whereby air will pass through said whistle when said air filter has become clogged, causing it to blow, and thereby giving a warning that said air filter has become clogged.
Claim 5
Dependent Claim
147 words
A warning system formed as part of a hair dryer to provide a warning whenever an air inlet of said hair dryer becomes overly clogged with hair other matter, said system including a dryer housing having an air inlet, an air filter across said air inlet, and means for supporting said air filter, said air filter having an outer side and an inner side inside of said housing, an air actuated whistle mounted in said air filter having a whistle air inlet and a whistle air outlet, said whistle being mounted with said whistle air inlet adjacent said outer side of said air filter and said whistle air outlet adjacent said inner side of said air filter, whereby air will pass through said whistle when said air filter has become clogged, causing it to blow, and thereby giving a warning that said air filter has become clogged.
Claim 6
Dependent Claim
31 words
A warning system as set forth in claim 3 in which said whistle will blow when the air pressure differential between the two sides of said filter reaches a predetermined level.
References Cited (Backward Citations)
US2753831A
Cited
US3699749A
Cited
US4254324A
Cited
US4215646A
Cited
US4215646B1
Cited
US4321070A
Cited
US4634839A
Cited
US4896021A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-07-04 | 1998-01-03 | 1998-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-07-04 | 2002-01-03 | 2002-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-07-04 | 2006-01-03 | 2006-07-05 | $7700.00 | Window Closed / Lapsed |