Patent US3144912A successfully refreshed from Google Patents.
US3144912A
Expired / Lapsed
US
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Masonry drilling apparatus
Assignee: Black and Decker Corp
•
Filing: 1960-11-21
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Granted: 1964-08-18
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Expires: 1980-11-21
Abstract
No abstract record available.
Inventors
- 👤 Arthur S Boehm
- 👤 Jr Robert H Riley
- 👤 Harold O Short
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:25
CPC Classifications
B; B23; B23Q; B23Q1/00; B23Q1/0009; B23Q1/0018; B23Q1/0027; B23Q1/0036
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
CA610188A
Cited
US1006661A
Cited
US1084152A
Cited
US1106966A
Cited
US2306598A
Cited
US2356921A
Cited
AT176195B
Cited
US2918260A
Cited
US2969846A
Cited
US3032129A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-08-18 | 1968-02-17 | 1968-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-18 | 1972-02-17 | 1972-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-18 | 1976-02-17 | 1976-08-18 | $7700.00 | Window Closed / Lapsed |