Patent US2435868A successfully refreshed from Google Patents.
US2435868A
Expired / Lapsed
US
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Drill pipe protector applicator
Assignee: Individual
•
Filing: 1940-03-09
•
Granted: 1948-02-10
•
Expires: 1960-03-09
Abstract
No abstract record available.
Inventors
- 👤 Frank C Boyd
- 👤 Harry E Hester
- 👤 Paul A Medearis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:03
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/10; E21B17/12; Y; Y10; Y10T; Y10T29/00; Y10T29/53; Y10T29/53657; Y10T29/53665
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1420509A
Cited
US46464A
Cited
GB190519883A
Cited
US1395140A
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US1552645A
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US1965876A
Cited
US1830814A
Cited
US1913933A
Cited
US1852613A
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US1968640A
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US2038840A
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US2086371A
Cited
FR815329A
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US2294506A
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US2291976A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-02-09 | 1951-08-11 | 1952-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-02-09 | 1955-08-11 | 1956-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-02-09 | 1959-08-11 | 1960-02-10 | $7700.00 | Window Closed / Lapsed |