US3422631A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for driving and lining an underground conduit
Assignee: Individual
•
Filing: 1966-11-16
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Granted: 1969-01-21
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Expires: 1986-11-16
Abstract
No abstract record available.
Inventors
- 👤 Daniel Silverman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:20
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/02; E21B43/10; E21B43/103; E21B43/105; E02; E02F; E02F5/00; E02F5/02; E02F5/10; E02F5/102; E21B19/00; E21B19/22; E21B7/00; E21B7/20; E21B7/205; E21B7/28; E21B7/30
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) | 1972-01-21 | 1972-07-22 | 1973-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-21 | 1976-07-22 | 1977-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-21 | 1980-07-22 | 1981-01-21 | $7700.00 | Window Closed / Lapsed |