US3431049A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method in rock blasting operations for marking out drill hole patterns
Assignee: Individual
•
Filing: 1966-09-07
•
Granted: 1969-03-04
•
Expires: 1986-09-07
Abstract
No abstract record available.
Inventors
- 👤 Bo Gunnar Nordgren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:22
CPC Classifications
E; E21; E21D; E21D9/00; E21D9/006
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
CA635284A
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US1804764A
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US2372494A
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US2555807A
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US2593007A
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US2783679A
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US2805471A
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US2906016A
Cited
US3120779A
Cited
US3117480A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-03-03 | 1972-09-02 | 1973-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-03 | 1976-09-02 | 1977-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-03 | 1980-09-02 | 1981-03-04 | $7700.00 | Window Closed / Lapsed |