US2439604A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Insulating confined spaces
Assignee: Wood Conversion Co
•
Filing: 1943-03-02
•
Granted: 1948-04-13
•
Expires: 1963-03-02
Abstract
No abstract record available.
Inventors
- 👤 Clark C Heritage
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:21
CPC Classifications
E; E04; E04F; E04F21/00; E04F21/02; E04F21/06; E04F21/08; E04F21/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US386231A
Cited
US1180812A
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US1923195A
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US1756468A
Cited
US1827858A
Cited
US1971123A
Cited
US2200713A
Cited
US2170469A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-04-13 | 1951-10-13 | 1952-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-04-13 | 1955-10-13 | 1956-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-04-13 | 1959-10-13 | 1960-04-13 | $7700.00 | Window Closed / Lapsed |