US3463249A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of flame drilling with abrasives
Assignee: Browning Engineering Corp
•
Filing: 1968-04-29
•
Granted: 1969-08-26
•
Expires: 1988-04-29
Abstract
No abstract record available.
Inventors
- 👤 James A Browning
- 👤 Ernest M Fitzgerald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:11
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/14; F; F23; F23D; F23D14/00; F23D14/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USRE22964E
Cited
US2399680A
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US2633332A
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US2675993A
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US3103251A
Cited
US2990653A
Cited
US3173499A
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US3245721A
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US3255802A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-08-25 | 1973-02-24 | 1973-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-08-25 | 1977-02-24 | 1977-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-08-25 | 1981-02-24 | 1981-08-26 | $7700.00 | Window Closed / Lapsed |