Patent US4756668A successfully refreshed from Google Patents.
US4756668A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air intake cover for a blower vacuum apparatus
Assignee: JOHN DEERE CONSUMER PRODUCTS Inc
•
Filing: 1987-07-23
•
Granted: 1988-07-12
•
Expires: 2007-07-23
Abstract
Abstract The invention is directed to a protective cover for the air intake opening in a blower-vacuum apparatus. The cover contains opening defined in the cover having a large cross sectional area relative to the area of the air intake opening. The openings in the cover are in the vertical wall of the cover to force the air to enter the apparatus radially.
Inventors
- 👤 James Gassen
- 👤 John E. Reed
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:50
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/70; F04D29/701; F04D29/703
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
97 words
A protective cover for an air intake opening of blower-vacuum apparatus comprising: A hollow wall member having a closed end and an open end, the open end for being positioned over the air intake opening, the hollow wall member having defined therein a plurality of openings for the passage of air radially into the interior of the protective cover, the total crossectional area of the openings in the wall member exceeds the crosssectional area of the air intake opening by 1.5 to 3 times for reducing the presssure per unit area of the air entering the cover.
Claim 2
Dependent Claim
97 words
A protective cover for an air intake opening of blower-vacuum apparatus comprising: A hollow wall member having a closed end and an open end, the open end for being positioned over the air intake opening, the hollow wall member having defined therein a plurality of openings for the passage of air radially into the interior of the protective cover, the total crossectional area of the openings in the wall member exceeds the crosssectional area of the air intake opening by 1.5 to 3 times for reducing the presssure per unit area of the air entering the cover.
Claim 3
Dependent Claim
14 words
A protective cover as defined in claim 1 wherein the wall member is conical.
References Cited (Backward Citations)
US2242616A
Cited
US2884863A
Cited
US4325163A
Cited
US4494908A
Cited
US4356535A
Cited
US4404706A
Cited
US4644606A
Cited
US4634346A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-07-12 | 1992-01-11 | 1992-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-12 | 1996-01-11 | 1996-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-12 | 2000-01-11 | 2000-07-12 | $7700.00 | Window Closed / Lapsed |