US2128172A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Block placing apparatus
Assignee: TUNNEL AND MINE MACHINERY Co
•
Filing: 1936-06-23
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Granted: 1938-08-23
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Expires: 1956-06-23
Abstract
No abstract record available.
Inventors
- 👤 Arthur W Warner
- 👤 Roscoe F Ballard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:39
CPC Classifications
E; E21; E21D; E21D11/00; E21D11/40; E21D11/04; E21D11/06; E21D11/07
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1941-08-22 | 1942-02-21 | 1942-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1945-08-22 | 1946-02-21 | 1946-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1949-08-22 | 1950-02-21 | 1950-08-23 | $7700.00 | Window Closed / Lapsed |