US3486572A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for forming inclined bores
Assignee: LAWRENCE Manufacturing CO
•
Filing: 1967-02-28
•
Granted: 1969-12-30
•
Expires: 1987-02-28
Abstract
No abstract record available.
Inventors
- 👤 William H Hamilton
- 👤 Richard J Allyn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 01:55
CPC Classifications
E; E21; E21B; E21B15/00; E21B15/006; E21B7/00; E21B7/28; E21D; E21D9/00; E21D9/10; E21D9/11; E21D9/112; E21D9/115
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US3376942A
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FR1457753A
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US3399738A
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US3418022A
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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) | 1972-12-29 | 1973-06-30 | 1973-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-12-29 | 1977-06-30 | 1977-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-12-29 | 1981-06-30 | 1981-12-30 | $7700.00 | Window Closed / Lapsed |