US2833518A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portable drilling machines
Assignee: NAT FIREPROOFING CORP
•
Filing: 1952-10-22
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Granted: 1958-05-06
•
Expires: 1972-10-22
Abstract
No abstract record available.
Inventors
- 👤 Augsburger Clyde
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:27
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US298625A
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US556349A
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US1185809A
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US1713471A
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US2088649A
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US2052301A
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US2104341A
Cited
US2179316A
Cited
US2292867A
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US2594098A
Cited
US2518362A
Cited
US2633331A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-05-05 | 1961-11-04 | 1962-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-05 | 1965-11-04 | 1966-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-05 | 1969-11-04 | 1970-05-06 | $7700.00 | Window Closed / Lapsed |