US3000617A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Seal means for a rotary heat exchanger
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1959-06-24
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Granted: 1961-09-19
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Expires: 1979-06-24
Abstract
No abstract record available.
Inventors
- 👤 Bartholomew J Kitko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:03
CPC Classifications
F; F28; F28D; F28D19/00; F28D19/04; F28D19/045; F28D19/047; Y; Y10; Y10S; Y10S165/00; Y10S165/009; Y10S165/013; Y10S165/016; Y10S165/02; Y10S165/024
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-09-18 | 1965-03-20 | 1965-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-09-18 | 1969-03-20 | 1969-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-09-18 | 1973-03-20 | 1973-09-19 | $7700.00 | Window Closed / Lapsed |