US3577871A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chain curtain
Assignee: Douglass Industries Inc
•
Filing: 1968-12-16
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Granted: 1971-05-11
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Expires: 1988-12-16
Abstract
Abstract Curtain attached to a mower comprising a plurality of chain elements hanging downwardly from the mower body. Cable means extend horizontally through links near the bottom of the chain elements to provide rigidity.
Inventors
- 👤 Anthony R Engler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:36
CPC Classifications
A; A01; A01D; A01D34/00; A01D34/01; A01D34/412; A01D34/63; A01D34/82; A01D34/828; A01D2101/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
24 words
The guard of claim 1 wherein said rigidifying means is a cable attached near its opposite ends to individual links of said chain elements.
Claim 2
Dependent Claim
20 words
The guard of claim 2 wherein said rigidifying means passes through individual links of substantially all of said chain elements.
Claim 3
Dependent Claim
30 words
The guard of claim 2 wherein said rigidifying means is attached to individual links of said chain elements by a U-shaped bolt encompassing said individual links and said rigidifying means.
Claim 4
Dependent Claim
36 words
The guard of claim 1 wherein said plurality of chain elements each comprises a pair of chain segments joined together by a connector link, said connector link being affixed to the housing of said cutting machine.
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) | 1974-05-10 | 1974-11-09 | 1975-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-10 | 1978-11-09 | 1979-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-10 | 1982-11-09 | 1983-05-11 | $7700.00 | Window Closed / Lapsed |