US3915211A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of shearing tree trunks
Assignee: Individual
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Filing: 1974-12-06
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Granted: 1975-10-28
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Expires: 1994-12-06
Abstract
Abstract Relatively thin shearing blades are held in tension by relatively heavy blade frames around the outer periphery thereof, and except along their straight cutting edges. These shearing blades are drawn simultaneously longitudinally along a tree trunk to be sheared in a first direction and transversely into the tree trunk, thereby exerting a drawing, cutting force from the ends of the shearing blades toward which these blades are moving.
Inventors
- 👤 Robert D Barwise
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:22
CPC Classifications
A; A01; A01G; A01G23/00; A01G23/02; A01G23/08; A01G23/087; A01G23/089
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
78 words
The method of shearing elongated fibrous material including the steps of: a. supporting opposite end straight edge extremities of a relatively thin sharp straight edge cutting blade in the relatively heavy blade frame to maintain the blade in tension; and b. drawing said blade simultaneously longitudinally along said material in a first direction and transversely into said material by exerting the drawing, cutting force from an end thereof toward which the blade is moving in said first direction.
Claim 2
Independent Claim
78 words
The method of shearing elongated fibrous material including the steps of: a. supporting opposite end straight edge extremities of a relatively thin sharp straight edge cutting blade in the relatively heavy blade frame to maintain the blade in tension; and b. drawing said blade simultaneously longitudinally along said material in a first direction and transversely into said material by exerting the drawing, cutting force from an end thereof toward which the blade is moving in said first direction.
Claim 3
Dependent Claim
42 words
The method of claim 1 wherein there are two such relatively thin sharpened straight edge cutting blades supporting in tension; and wherein the drawing step is accomplished simultaneously by each blade moving toward the other and moving longitudinally in said first direction.
Claim 4
Dependent Claim
40 words
The method of claim 2 and a first step of supporting the fibrous material against a backup plate; aNd wherein the step of drawing both blades in said first direction is accomplished by each blade moving toward said backup plate.
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) | 1978-10-27 | 1979-04-28 | 1979-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-27 | 1983-04-28 | 1983-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-27 | 1987-04-28 | 1987-10-28 | $7700.00 | Window Closed / Lapsed |