Patent US3852346A successfully refreshed from Google Patents.
Patent US3687730A successfully refreshed from Google Patents.
US3687730A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Doctor cleaning methods and apparatus with scanning suction port
Assignee: Lodding Engineering Corp
•
Filing: 1971-03-15
•
Granted: 1972-08-29
•
Expires: 1991-03-15
Abstract
Abstract THE CLEANING APPARATUS COMPRISES A SUCTION CHAMBER HAVING AN OPEN MOUTH EXTENDING ALONG THE LENGTH OF A DOCTOR AND A DRIVEN ENDLESS BELT WHICH IS GUIDED ACROSS THE SUCTION CHAMBER MOUTH IN SEALING RELATIONSHIP THERETO. THE BELT HAS ONE OR MORE OPENINGS WHOSE TOTAL EFFECTIVE AREA IS SMALL COMPARED TO THE EFFECTIVE AREA OF THE CHAMBER MOUTH. A HIGH SUCTION PORT IS THUS ESTABLISHED WHICH SCANS THE DOCTOR TO INHALE FINES COLLECTED ON THE DOCTOR. IN A SECOND DISCLOSED EMBODIMENT, A BELT AS DESCRIBED HAS ALSO SWEEPING MEANS EXTENDING THEREFROM FOR SWEEPING FROM THE DOCTOR DEPOSITED MATTER TOO LARGE OR TOO HEAVY TO BE INHALED THROUGH THE OPENING OR OPENINGS IN THE BELT.
Inventors
- 👤 William M Murphy
- 👤 Norman J Beauchemin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:37
CPC Classifications
B; B08; B08B; B08B1/00; B08B1/30; D; D21; D21G; D21G3/00; D21G3/005
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1975-08-29 | 1976-02-28 | 1976-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-29 | 1980-02-28 | 1980-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-29 | 1984-02-28 | 1984-08-29 | $7700.00 | Window Closed / Lapsed |