Patent US3636685A successfully refreshed from Google Patents.
US3636685A
Expired / Lapsed
US
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Rotary lawnmower blade
Assignee: Individual
•
Filing: 1971-03-15
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Granted: 1972-01-25
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Expires: 1991-03-15
Abstract
Abstract A rotary lawnmower blade having cutting edges along the leading edges thereof adjacent the respective ends in which the trailing edges opposite the cutting edges each have an opening therethrough and a vane paralleling the opening that is canted to create an updraft through the opening and thereby pull grass up into the cutting circle of the blade.
Inventors
- 👤 Clifford H Speckman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:09
CPC Classifications
A; A01; A01D; A01D34/00; A01D34/01; A01D34/412; A01D34/63; A01D34/73
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
59 words
A rotary lawnmower blade having cutting edges along the leading edges thereof adjacent the respective ends, means defining an opening in the trailing edge of each end of the blade, said means including a vane at the trailing edge that is canted such that its lower edge leads its upper edge in the direction of rotation of the blade.
Claim 2
Dependent Claim
59 words
A rotary lawnmower blade having cutting edges along the leading edges thereof adjacent the respective ends, means defining an opening in the trailing edge of each end of the blade, said means including a vane at the trailing edge that is canted such that its lower edge leads its upper edge in the direction of rotation of the blade.
Claim 3
Dependent Claim
26 words
A rotary Lawnmower blade as set forth in claim 1 in which said opening is in the form of a slot extending longitudinally of the blade.
Claim 4
Dependent Claim
25 words
A rotary lawnmower blade as set forth in claim 2 in which each vane is substantially as long as and parallels the adjacent cutting edge.
Claim 5
Dependent Claim
47 words
A rotary lawnmower blade as set forth in claim 2 in which an outer endwise portion of the blade is bent to slant upwardly toward the trailing edge, and in which the lower leading edge of said vane extends no farther down than the adjacent cutting edge.
Claim 6
Dependent Claim
31 words
A rotary lawnmower blade as set forth in claim 2 in which the respective inner and outer ends of each vane are curved around the respective ends of the adjacent slot.
Claim 7
Dependent Claim
16 words
A rotary lawnmower blade as set forth in claim 1 in which each vane is planar.
Claim 8
Dependent Claim
29 words
A rotary lawnmower blade as set forth in claim 1 in which at least the outer end of each vane is curved around the adjacent end of said slot.
Claim 9
Dependent Claim
19 words
A rotary lawnmower blade as set forth in claim 1 in which said vane is integral with said blade.
Claim 10
Dependent Claim
25 words
A rotary lawnmower blade as set forth in claim 1 in which said vane extends both below and above the trailing edge of said blade.
Claim 11
Dependent Claim
23 words
A rotary lawnmower blade as set forth in claim 1 in which said vane extends only below the trailing edge of said blade.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-24 | 1975-07-26 | 1976-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-24 | 1979-07-26 | 1980-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-24 | 1983-07-26 | 1984-01-25 | $7700.00 | Window Closed / Lapsed |