Patent US2638981A successfully refreshed from Google Patents.
US2638981A
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Gun perforator actuator
Assignee: JOHN D CHESNUT
•
Filing: 1948-01-22
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Granted: 1953-05-19
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Expires: 1968-01-22
Abstract
No abstract record available.
Inventors
- 👤 Thomas C Bannon
- 👤 Spencer Lloyd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:14
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/11; E21B43/116
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1543903A
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US904657A
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US1080313A
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US2203265A
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US2243099A
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US2330509A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-18 | 1956-11-17 | 1957-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-18 | 1960-11-17 | 1961-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-18 | 1964-11-17 | 1965-05-19 | $7700.00 | Window Closed / Lapsed |