Patent US2539991A successfully refreshed from Google Patents.
US2539991A
Expired / Lapsed
US
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Pressure expansion gun
Assignee: ELMER R PERKINS
•
Filing: 1949-09-09
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Granted: 1951-01-30
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Expires: 1969-09-09
Abstract
No abstract record available.
Inventors
- 👤 Robert S Chapman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:58
CPC Classifications
D; D21; D21B; D21B1/00; D21B1/04; D21B1/12; D21B1/30; D21B1/36
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1279517A
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US1878782A
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US1692575A
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US1824221A
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US1938060A
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US2027698A
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US2086266A
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US2279868A
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US2304543A
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US2379062A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-01-29 | 1954-07-31 | 1955-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-29 | 1958-07-31 | 1959-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-29 | 1962-07-31 | 1963-01-30 | $7700.00 | Window Closed / Lapsed |