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US2776857A
Expired / Lapsed
US
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Vacuum lifter
Assignee: Heppenstall Co
•
Filing: 1952-02-23
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Granted: 1957-01-08
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Expires: 1972-02-23
Abstract
No abstract record available.
Inventors
- 👤 Max R Heppenstall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:34
CPC Classifications
B; B66; B66C; B66C1/00; B66C1/02; B66C1/0293; B66C1/0212; B66C1/0218
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1006315A
Cited
US1506827A
Cited
US1839389A
Cited
US2193097A
Cited
US2216383A
Cited
US2420811A
Cited
GB642100A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-01-08 | 1960-07-09 | 1961-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-08 | 1964-07-09 | 1965-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-08 | 1968-07-09 | 1969-01-08 | $7700.00 | Window Closed / Lapsed |