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US2689688A
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Low-pressure method and apparatus for pneumatic elevating
Assignee: Simon Corrugating Machinery Ltd
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Filing: 1951-08-27
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Granted: 1954-09-21
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Expires: 1971-08-27
Abstract
No abstract record available.
Inventors
- 👤 Ball John Stephen
- 👤 Lockwood Joseph Flawith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:46
CPC Classifications
B; B65; B65G; B65G53/00; B65G53/34; B65G53/40; B65G53/42
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US297757A
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US1897144A
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US671161A
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US696870A
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US788741A
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US1609401A
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US1793098A
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US2087464A
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CH231487A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-09-20 | 1958-03-22 | 1958-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-20 | 1962-03-22 | 1962-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-20 | 1966-03-22 | 1966-09-21 | $7700.00 | Window Closed / Lapsed |