Patent US3438171A successfully refreshed from Google Patents.
US3438171A
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US
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Bricklaying machine
Assignee: Demarest Machines Inc
•
Filing: 1966-10-24
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Granted: 1969-04-15
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Expires: 1986-10-24
Abstract
No abstract record available.
Inventors
- 👤 Douglas M Demarest
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:58
CPC Classifications
E; E04; E04G; E04G21/00; E04G21/14; E04G21/16; E04G21/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1411172A
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US1606001A
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US772191A
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US1221689A
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US1277777A
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US1686279A
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US1666555A
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US1929324A
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US2401913A
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US2599552A
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US3177621A
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US3325960A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-14 | 1972-10-14 | 1973-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-14 | 1976-10-14 | 1977-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-14 | 1980-10-14 | 1981-04-15 | $7700.00 | Window Closed / Lapsed |