US3596305A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Doctors for paper making and like machines
Assignee: Vickerys Ltd
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Filing: 1968-05-13
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Granted: 1971-08-03
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Expires: 1988-05-13
Abstract
No abstract record available.
Inventors
- 👤 Albert Henry John Boyland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:00
CPC Classifications
D; D21; D21G; D21G3/00; D21G3/005
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
153 words
A doctor for papermaking machines and the like comprising; a holder having a forwardly projecting nose, a doctor blade held in engagement with said holder with its rear end located rearwardly of said nose and its front end adapted to bear against a roll to be doctored, the face of said blade remote from said nose being in contact with said roll, a yieldable pressure plate, means in said holder for retaining the rear end of said pressure plate in the holder, the front end of said pressure plate being adapted to bear against said remote face of said blade at a location spaced rearwardly from said nose, said blade making line contact at the opposite face thereof with said nose and being free to pivot about said nose while the rear end of said blade moves with respect to the holder against the pressure exerted on the blade by said pressure plate.
Claim 2
Dependent Claim
153 words
A doctor for papermaking machines and the like comprising; a holder having a forwardly projecting nose, a doctor blade held in engagement with said holder with its rear end located rearwardly of said nose and its front end adapted to bear against a roll to be doctored, the face of said blade remote from said nose being in contact with said roll, a yieldable pressure plate, means in said holder for retaining the rear end of said pressure plate in the holder, the front end of said pressure plate being adapted to bear against said remote face of said blade at a location spaced rearwardly from said nose, said blade making line contact at the opposite face thereof with said nose and being free to pivot about said nose while the rear end of said blade moves with respect to the holder against the pressure exerted on the blade by said pressure plate.
Claim 3
Dependent Claim
41 words
A doctor as claimed in claim 1, in which the nose on the holder makes line contact with the blade and the holder has a lip which makes line contact with the side of the pressure plate remote from the blade.
Claim 4
Dependent Claim
45 words
A doctor as claimed in claim 1, which includes a removable packing piece extending for the full length of the blade and inserted between the pressure plate and a lip on the holder which faces the side of the pressure plate remote from the holder.
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) | 1974-08-02 | 1975-02-01 | 1975-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-02 | 1979-02-01 | 1979-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-02 | 1983-02-01 | 1983-08-03 | $7700.00 | Window Closed / Lapsed |