US3465834A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Guided subterranean penetrator systems
Assignee: AT&T Inc
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Filing: 1968-03-18
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Granted: 1969-09-09
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Expires: 1988-03-18
Abstract
No abstract record available.
Inventors
- 👤 Hamilton Southworth Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:56
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/02; E21B4/00; E21B4/06; E21B4/14; E21B4/145; E21B7/00; E21B7/04; E21B7/06; E21B7/068; E21B7/26; E21B7/267
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-09-08 | 1973-03-10 | 1973-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-09-08 | 1977-03-10 | 1977-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-09-08 | 1981-03-10 | 1981-09-09 | $7700.00 | Window Closed / Lapsed |