US2763195A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air conditioning of entrance areas
Assignee: Individual
•
Filing: 1951-07-16
•
Granted: 1956-09-18
•
Expires: 1971-07-16
Abstract
No abstract record available.
Inventors
- 👤 William J Caldwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:06
CPC Classifications
F; F24; F24F; F24F3/00; F24F3/044
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US843909A
Cited
US1981164A
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US2004927A
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US1832508A
Cited
US1985050A
Cited
US2150252A
Cited
US2223287A
Cited
US2234633A
Cited
US2332091A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-09-18 | 1960-03-19 | 1960-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-09-18 | 1964-03-19 | 1964-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-09-18 | 1968-03-19 | 1968-09-18 | $7700.00 | Window Closed / Lapsed |