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US2655348A
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Heat exchange and sound absorbing wall unit
Assignee: Johns Manville Corp
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Filing: 1949-11-17
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Granted: 1953-10-13
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Expires: 1969-11-17
Abstract
No abstract record available.
Inventors
- 👤 Robert L Siering
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:41
CPC Classifications
E; E04; E04B; E04B9/00; E04B9/34; E04B9/345; E04B1/00; E04B1/62; E04B1/74; E04B1/82; E04B1/8209; F; F24; F24D; F24D3/00; F24D3/12; F24D3/16; F24D3/165; E04B2001/8263; Y; Y02; Y02B; Y02B30/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1771268A
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US1800150A
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US1952896A
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GB403899A
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US2112631A
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US2172771A
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US2160638A
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GB540678A
Cited
US2480427A
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US2527031A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-10-12 | 1957-04-13 | 1957-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-10-12 | 1961-04-13 | 1961-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-10-12 | 1965-04-13 | 1965-10-13 | $7700.00 | Window Closed / Lapsed |