US2504308A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heating and cooling cover
Assignee: Individual
•
Filing: 1948-02-09
•
Granted: 1950-04-18
•
Expires: 1968-02-09
Abstract
No abstract record available.
Inventors
- 👤 Jr Lucius B Donkle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 08:03
CPC Classifications
A; A47; A47G; A47G9/00; A47G9/02; A47G9/0207; A47G9/0215; A61; A61F; A61F7/00; A61F2007/0054; A61F2007/0056; A61F7/0097
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-04-17 | 1953-10-17 | 1954-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-04-17 | 1957-10-17 | 1958-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-04-17 | 1961-10-17 | 1962-04-18 | $7700.00 | Window Closed / Lapsed |