Patent US3449858A successfully refreshed from Google Patents.
Patent US3304910A successfully refreshed from Google Patents.
US3304910A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Doctor blade for coating apparatus
Assignee: Champion Papers Inc
•
Filing: 1963-02-20
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Granted: 1967-02-21
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Expires: 1983-02-20
Abstract
No abstract record available.
Inventors
- 👤 Warner Edgar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:49
CPC Classifications
D; D21; D21H; D21H25/00; D21H25/08; D21H25/12; D06; D06B; D06B15/00; D06B15/08; D06B15/085; D21H5/00; D21H5/0005; D21H5/006; D21H5/0062; D21H5/0067
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
52 words
IN THE COMBINATION OF A REVOLVABLE CYLINDRICAL DOCTOR ROD AND A MAGNETIC HOLDER MEANS HAVING MAGNETIC MEMBERS FOR MAINTAINING SAID ROD IN POSITION DURING THE FORMING OF A COATING ON A WEB, THE IMPROVEMENT COMPRISING A DOCTOR SURFACE ON SAID ROD COMPOSED OF A SERIES OF ALTERNATELY ARRANGED ANNULAR RIBS AND GROOVES;
Claim 2
Dependent Claim
52 words
IN THE COMBINATION OF A REVOLVABLE CYLINDRICAL DOCTOR ROD AND A MAGNETIC HOLDER MEANS HAVING MAGNETIC MEMBERS FOR MAINTAINING SAID ROD IN POSITION DURING THE FORMING OF A COATING ON A WEB, THE IMPROVEMENT COMPRISING A DOCTOR SURFACE ON SAID ROD COMPOSED OF A SERIES OF ALTERNATELY ARRANGED ANNULAR RIBS AND GROOVES;
References Cited (Backward Citations)
US2221441A
Cited
US2599947A
Cited
US2672119A
Cited
US2774329A
Cited
US2961336A
Cited
US3179083A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-02-20 | 1970-08-22 | 1971-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-20 | 1974-08-22 | 1975-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-20 | 1978-08-22 | 1979-02-21 | $7700.00 | Window Closed / Lapsed |