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Patent US2533771A successfully refreshed from Google Patents.
US2533771A
Expired / Lapsed
US
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Vented closure for milk tank manholes
Assignee: PENNSYLVANIA FURNACE AND IRON
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Filing: 1948-07-09
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Granted: 1950-12-12
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Expires: 1968-07-09
Abstract
No abstract record available.
Inventors
- 👤 Frees Joseph H De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:05
CPC Classifications
B; B67; B67D; B67D7/00; B67D7/06; B60; B60P; B60P3/00; B60P3/22; B60P3/224; B60P3/226
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-12-11 | 1954-06-12 | 1954-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-12-11 | 1958-06-12 | 1958-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-12-11 | 1962-06-12 | 1962-12-12 | $7700.00 | Window Closed / Lapsed |