US2660409A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radiant heat exchange and acoustical structure for buildings
Assignee: Johns Manville Corp
•
Filing: 1950-07-10
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Granted: 1953-11-24
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Expires: 1970-07-10
Abstract
No abstract record available.
Inventors
- 👤 Jr Howard R Pittenger
- 👤 Jack D Verschoor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:17
CPC Classifications
F; F24; F24D; F24D3/00; F24D3/12; F24D3/16; F24D3/165; Y; Y02; Y02B; Y02B30/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB321450A
Cited
GB335634A
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DE639640C
Cited
US2172771A
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US2180945A
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US2221001A
Cited
US2469963A
Cited
US2489130A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-23 | 1957-05-25 | 1957-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-23 | 1961-05-25 | 1961-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-23 | 1965-05-25 | 1965-11-24 | $7700.00 | Window Closed / Lapsed |