Patent US2485881A successfully refreshed from Google Patents.
Patent US3507338A successfully refreshed from Google Patents.
US3507338A
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US
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Hole-forming and post-driving apparatus
Assignee: MCWATERS CONSTRUCTION CO
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Filing: 1968-12-09
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Granted: 1970-04-21
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Expires: 1988-12-09
Abstract
No abstract record available.
Inventors
- 👤 William A Mcwaters
- 👤 Darnel L Alexander
- 👤 James M Alexander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:46
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/02; E21B7/027; E04; E04H; E04H12/00; E04H12/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US626107A
Cited
USRE25060E
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US1247634A
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US2950603A
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US3026949A
Cited
US3400771A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-04-20 | 1973-10-20 | 1974-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-04-20 | 1977-10-20 | 1978-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-04-20 | 1981-10-20 | 1982-04-21 | $7700.00 | Window Closed / Lapsed |