Patent US2750233A successfully refreshed from Google Patents.
US2750233A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary solids transfer pump
Assignee: Bituminous Coal Research Inc
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Filing: 1953-06-23
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Granted: 1956-06-12
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Expires: 1973-06-23
Abstract
No abstract record available.
Inventors
- 👤 John I Yellott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:46
CPC Classifications
B; B65; B65G; B65G53/00; B65G53/34; B65G53/40; B65G53/46; B65G53/4608; B65G53/4625; B65G53/4633; F; F02; F02C; F02C3/00; F02C3/20; F02C3/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
IN A ROTARY SOLIDS TRANSFER PUMP OF THE CHARACTER DESCRIBED, THE IMPROVEMENTS COMPRISING SEALING MEANS SEATED IN ANNULAR GROOVES IN THE CASING WALLS AND APPOSABLE WITH THE ROTOR TO SEAL THE GAPS BETWEEN THE FACES OF THE ROTOR AND THE CASING WALLS, WHEREBY ENTRANCE OF SOLIDS INTO THE SPACES BETWEEN THE ROTOR FACES AND THE CASING WALLS IS PREVENTED, FLUID PRESSURE MEANS COUPLED TO THE SAID CASING WALL GROOVES AND OPERABLE TO BIAS THE SEALING MEANS INTO SEALING POSITION, AND SEPARATE PENEUMATIC FLUID ENTRANT MEANS COUPLED TO THE PUMP CASING RADIALLY INWARD OF THE SEALING MEANS, THE ROTOR BEING AXIALLY APERTURED BY A CIRCULAR ARRAY OF APERTURES SEVERALLY EXTENDING THROUGH THE ROTOR AND CIRCUMJACENT THE ROTOR SHAFT.
Claim 2
Dependent Claim
117 words
IN A ROTARY SOLIDS TRANSFER PUMP OF THE CHARACTER DESCRIBED, THE IMPROVEMENTS COMPRISING SEALING MEANS SEATED IN ANNULAR GROOVES IN THE CASING WALLS AND APPOSABLE WITH THE ROTOR TO SEAL THE GAPS BETWEEN THE FACES OF THE ROTOR AND THE CASING WALLS, WHEREBY ENTRANCE OF SOLIDS INTO THE SPACES BETWEEN THE ROTOR FACES AND THE CASING WALLS IS PREVENTED, FLUID PRESSURE MEANS COUPLED TO THE SAID CASING WALL GROOVES AND OPERABLE TO BIAS THE SEALING MEANS INTO SEALING POSITION, AND SEPARATE PENEUMATIC FLUID ENTRANT MEANS COUPLED TO THE PUMP CASING RADIALLY INWARD OF THE SEALING MEANS, THE ROTOR BEING AXIALLY APERTURED BY A CIRCULAR ARRAY OF APERTURES SEVERALLY EXTENDING THROUGH THE ROTOR AND CIRCUMJACENT THE ROTOR SHAFT.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-06-12 | 1959-12-12 | 1960-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-06-12 | 1963-12-12 | 1964-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-06-12 | 1967-12-12 | 1968-06-12 | $7700.00 | Window Closed / Lapsed |