Patent US2953971A successfully refreshed from Google Patents.
US2953971A
Expired / Lapsed
US
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Gun perforator
Assignee: Dresser Industries Inc
•
Filing: 1954-10-04
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Granted: 1960-09-27
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Expires: 1974-10-04
Abstract
No abstract record available.
Inventors
- 👤 Forrest V Porter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:28
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/11; E21B43/116
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US425574A
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US677527A
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US2048451A
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US2029454A
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US2358951A
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US2281870A
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US2328308A
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US2419949A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-09-27 | 1964-03-28 | 1964-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-09-27 | 1968-03-28 | 1968-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-09-27 | 1972-03-28 | 1972-09-27 | $7700.00 | Window Closed / Lapsed |