US3529682A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Location detection and guidance systems for burrowing device
Assignee: AT&T Inc
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Filing: 1968-10-03
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Granted: 1970-09-22
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Expires: 1988-10-03
Abstract
No abstract record available.
Inventors
- 👤 James C Coyne
- 👤 Frederick J Elia
- 👤 Hamilton Southworth Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:15
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/04; E21B7/046; E21B47/00; E21B47/02; E21B47/022; E21B47/0228; E21B47/0232; E21B47/024; E21B7/06; G; G01; G01V; G01V3/00; G01V3/08; G01V3/10; G01V3/104
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) | 1973-09-21 | 1974-03-23 | 1974-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-09-21 | 1978-03-23 | 1978-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-09-21 | 1982-03-23 | 1982-09-22 | $7700.00 | Window Closed / Lapsed |