Patent US2806277A successfully refreshed from Google Patents.
US2806277A
Expired / Lapsed
US
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Wall-forming process
Assignee: Individual
•
Filing: 1950-05-10
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Granted: 1957-09-17
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Expires: 1970-05-10
Abstract
No abstract record available.
Inventors
- 👤 Hand Don
- 👤 Willis R Swanson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:37
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)
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US1180472A
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US1472516A
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US1570617A
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US1727580A
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US1841581A
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US1747555A
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US1789791A
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US1848014A
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US2018192A
Cited
US2000409A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-16 | 1961-03-18 | 1961-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-16 | 1965-03-18 | 1965-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-16 | 1969-03-18 | 1969-09-17 | $7700.00 | Window Closed / Lapsed |