US3322221A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pneumatic lifting device and weigher for flat goods
Assignee: Maschinenfabrik Hasenclever AG
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Filing: 1965-10-22
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Granted: 1967-05-30
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Expires: 1985-10-22
Abstract
No abstract record available.
Inventors
- 👤 Engelen Heinz
- 👤 Dischler Helmut
- 👤 Albert Gunter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:00
CPC Classifications
B; B66; B66C; B66C1/00; B66C1/02; B66C1/0212; B66C1/0293
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
139 words
A LIFTING DEVICE FOR FLAT GOODS, COMPRISING: A CYLINDER WITH A SUBSTANTIALLY VERTICAL AXIS; A PISTON HEAD AXIALLY MOVABLKE IN SAID CYLINDER; SUSPENSION MEANS AT AN UPPER END OF SAID CYLINDER FOR ELEVATING SAME; MEANS FOR AXIALLY DRAWING SAID PISTON HEAD UPWARDLY WITHIN SAID CYLINDER FOR GENERATING A PARTIAL VACUUM THEREBELOW, SAID CYLINDER BEING PROVIDED AT ITS LOWER END WITH A SUCTION HEAD AND AN OPENING COMMUNICATING BETWEEN SAID SUCTION HEAD AND SAID CYLINDER BELOW SAID PISTON HEAD; AND AN ANNULAR FLEXIBLE SEAL WITHIN SAID CYLINDER IN ALLAROUND FIXED PERIPHERAL ENGAGEMENT THEREWITH AND IN ALL-AROUND FIXED PERIPERAL ENGAGEMENT WITH SAID PISTON HEAD, THEREBY FORMING A SEAL BETWEEN SAID PISTON HEAD AND SAID CYLINDER WHEREBY A PARTIAL VACUUM IS DEVELOPED IN SAID SUCTION HEAD AND MAINTAINED UPON ELEVATION OF SAID PISTON HEAD WITHIN SAID CYLINDER AWAY FROM SAID SUCTION HEAD.
Claim 2
Dependent Claim
139 words
A LIFTING DEVICE FOR FLAT GOODS, COMPRISING: A CYLINDER WITH A SUBSTANTIALLY VERTICAL AXIS; A PISTON HEAD AXIALLY MOVABLKE IN SAID CYLINDER; SUSPENSION MEANS AT AN UPPER END OF SAID CYLINDER FOR ELEVATING SAME; MEANS FOR AXIALLY DRAWING SAID PISTON HEAD UPWARDLY WITHIN SAID CYLINDER FOR GENERATING A PARTIAL VACUUM THEREBELOW, SAID CYLINDER BEING PROVIDED AT ITS LOWER END WITH A SUCTION HEAD AND AN OPENING COMMUNICATING BETWEEN SAID SUCTION HEAD AND SAID CYLINDER BELOW SAID PISTON HEAD; AND AN ANNULAR FLEXIBLE SEAL WITHIN SAID CYLINDER IN ALLAROUND FIXED PERIPHERAL ENGAGEMENT THEREWITH AND IN ALL-AROUND FIXED PERIPERAL ENGAGEMENT WITH SAID PISTON HEAD, THEREBY FORMING A SEAL BETWEEN SAID PISTON HEAD AND SAID CYLINDER WHEREBY A PARTIAL VACUUM IS DEVELOPED IN SAID SUCTION HEAD AND MAINTAINED UPON ELEVATION OF SAID PISTON HEAD WITHIN SAID CYLINDER AWAY FROM SAID SUCTION HEAD.
References Cited (Backward Citations)
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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) | 1970-05-29 | 1970-11-28 | 1971-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-05-29 | 1974-11-28 | 1975-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-05-29 | 1978-11-28 | 1979-05-30 | $7700.00 | Window Closed / Lapsed |