US2581862A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Insulation
Assignee: Individual
•
Filing: 1944-09-14
•
Granted: 1952-01-08
•
Expires: 1964-09-14
Abstract
No abstract record available.
Inventors
- 👤 John S Johnson
- 👤 Earl L Schulman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:18
CPC Classifications
H; H02; H02K; H02K3/00; H02K3/32
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US404913A
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US1019406A
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US1150022A
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US1264749A
Cited
US1897544A
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US1829491A
Cited
US2255313A
Cited
US2258218A
Cited
US2337920A
Cited
US2370046A
Cited
US2454218A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-01-07 | 1955-07-09 | 1956-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-01-07 | 1959-07-09 | 1960-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-01-07 | 1963-07-09 | 1964-01-08 | $7700.00 | Window Closed / Lapsed |