US2678557A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic pressure mortar trowel
Assignee: Individual
•
Filing: 1948-12-22
•
Granted: 1954-05-18
•
Expires: 1968-12-22
Abstract
No abstract record available.
Inventors
- 👤 Marion R Black
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:06
CPC Classifications
E; E04; E04F; E04F21/00; E04F21/02; E04F21/06; E04F21/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1306830A
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US760027A
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US1085566A
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US1399849A
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US1471091A
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US2105160A
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US2104086A
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US2236737A
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US2220119A
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US2413684A
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US2436783A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-05-17 | 1957-11-16 | 1958-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-17 | 1961-11-16 | 1962-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-17 | 1965-11-16 | 1966-05-18 | $7700.00 | Window Closed / Lapsed |