US4416033A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Full bag indicator
Assignee: Hoover Co
•
Filing: 1981-10-08
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Granted: 1983-11-22
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Expires: 2001-10-08
Abstract
Abstract There is provided a full bag indicator which is calibrated by movement of it along the structure it is mounted to, to thereby vary an aperture leading into the full bag indicator.
Inventors
- 👤 Glenn E. Specht
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:28
CPC Classifications
A; A47; A47L; A47L9/00; A47L9/10; A47L9/19; Y; Y10; Y10S; Y10S55/00; Y10S55/34
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
99 words
A bag condition indicator for a vacuum cleaner, including; (a) a vacuum cleaner shell, (b) an aperture in said shell, (c) a housing for said bag condition indicator, (d) a spring urged piston mounted in said housing such that air may flow between said housing and said piston, (e) an aperture in said housing in an air flow path between said shell aperture and said piston, (f) said housing being movably mounted on said shell to vary the flow area of one of said apertures to thereby alter the flow rate of atmospheric air passing through said housing aperture.
Claim 2
Dependent Claim
99 words
A bag condition indicator for a vacuum cleaner, including; (a) a vacuum cleaner shell, (b) an aperture in said shell, (c) a housing for said bag condition indicator, (d) a spring urged piston mounted in said housing such that air may flow between said housing and said piston, (e) an aperture in said housing in an air flow path between said shell aperture and said piston, (f) said housing being movably mounted on said shell to vary the flow area of one of said apertures to thereby alter the flow rate of atmospheric air passing through said housing aperture.
Claim 3
Dependent Claim
29 words
A bag condition indicator for a cleaner as set out in claim 1 wherein; (a) said aperture in said shell receives a viewing window of said bag condition indicator.
Claim 4
Dependent Claim
50 words
A bag condition indicator for a cleaner as set out in claim 2 wherein; (a) means for gasketingly sealing the bag condition indicator to the shell is provided, (b) said means for gasketing generally limiting air flow into the bag condition indicator to flow through said aperture in said shell.
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) | 1986-11-21 | 1987-05-23 | 1987-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-21 | 1991-05-23 | 1991-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-21 | 1995-05-23 | 1995-11-22 | $7700.00 | Window Closed / Lapsed |