Patent US2437509A successfully refreshed from Google Patents.
US2437509A
Expired / Lapsed
US
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Insulated wall construction for hulls, deck houses, and the like
Assignee: Dravo Corp
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Filing: 1945-02-03
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Granted: 1948-03-09
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Expires: 1965-02-03
Abstract
No abstract record available.
Inventors
- 👤 Albert J Dawson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:29
CPC Classifications
B; B63; B63B; B63B3/00; B63B3/14; B63B3/68
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB107078A
Cited
US754039A
Cited
GB216184A
Cited
US1614411A
Cited
GB277748A
Cited
US1888039A
Cited
FR768780A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-03-09 | 1951-09-08 | 1952-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-03-09 | 1955-09-08 | 1956-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-03-09 | 1959-09-08 | 1960-03-09 | $7700.00 | Window Closed / Lapsed |