Patent US2575941A successfully refreshed from Google Patents.
US2575941A
Expired / Lapsed
US
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Insulating covering
Assignee: Individual
•
Filing: 1947-07-29
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Granted: 1951-11-20
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Expires: 1967-07-29
Abstract
No abstract record available.
Inventors
- 👤 Brunnzell Fridolf Henning
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:10
CPC Classifications
E; E04; E04B; E04B1/00; E04B1/62; E04B1/74; E04B1/76; E04B1/762; F; F16; F16L; F16L59/00; F16L59/04; F16L59/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US340691A
Cited
US1969621A
Cited
US2052984A
Cited
US2142542A
Cited
US2238022A
Cited
US2206680A
Cited
GB617623A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-11-19 | 1955-05-21 | 1955-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-11-19 | 1959-05-21 | 1959-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-11-19 | 1963-05-21 | 1963-11-20 | $7700.00 | Window Closed / Lapsed |