US3462850A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger
Assignee: National Gypsum Co
•
Filing: 1966-08-16
•
Granted: 1969-08-26
•
Expires: 1986-08-16
Abstract
No abstract record available.
Inventors
- 👤 Richard E Galer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:19
CPC Classifications
F; F26; F26B; F26B3/00; F26B3/02; F26B3/06; F26B3/08; F26B3/084; F28; F28D; F28D13/00; F28D7/00; F28D7/16; F28D7/1615; F28D21/00; F28D2021/0019; F28D2021/0045; Y; Y10; Y10S; Y10S165/00; Y10S165/905
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2884373A
Cited
US2911198A
Cited
US3031769A
Cited
US3264751A
Cited
US3203404A
Cited
US3384557A
Cited
US3228456A
Cited
US3372742A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-08-25 | 1973-02-24 | 1973-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-08-25 | 1977-02-24 | 1977-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-08-25 | 1981-02-24 | 1981-08-26 | $7700.00 | Window Closed / Lapsed |