US3547202A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coaxial heat exchange apparatus with spacers
Assignee: Owens Corning
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Filing: 1969-01-15
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Granted: 1970-12-15
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Expires: 1989-01-15
Abstract
No abstract record available.
Inventors
- 👤 Winton A Ticknor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:18
CPC Classifications
F; F23; F23L; F23L15/00; F23L15/04; C; C03; C03B; C03B5/00; C03B5/16; C03B5/235; C03B5/237; F28; F28D; F28D21/00; F28D21/0001; F28D21/0003; F28D7/00; F28D7/10; F28D7/103; Y; Y02; Y02E; Y02E20/00; Y02E20/34; Y02P; Y02P40/00; Y02P40/50; Y02P40/57; Y10; Y10S; Y10S165/00; Y10S165/051; Y10S165/052; Y10S165/06; Y10S165/901
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-12-14 | 1974-06-15 | 1974-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-12-14 | 1978-06-15 | 1978-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-12-14 | 1982-06-15 | 1982-12-15 | $7700.00 | Window Closed / Lapsed |