Patent US3492934A successfully refreshed from Google Patents.
US3492934A
Expired / Lapsed
US
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Method and device for ventilating or air-conditioning
Assignee: Messer Griesheim GmbH
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Filing: 1968-02-13
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Granted: 1970-02-03
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Expires: 1988-02-13
Abstract
No abstract record available.
Inventors
- 👤 Karl Heinz Steigerwald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:42
CPC Classifications
B; B64; B64D; B64D13/00; B64D13/06; B64D13/08; F; F24; F24F; F24F13/00; F24F13/02; F24F13/06; F24F13/068; F24F7/00; F24F7/04; F24F7/06; F24F7/10; B64D2013/0603; B64D2013/0625; Y; Y02; Y02T; Y02T50/00; Y02T50/40
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) | 1973-02-02 | 1973-08-04 | 1974-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-02 | 1977-08-04 | 1978-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-02 | 1981-08-04 | 1982-02-03 | $7700.00 | Window Closed / Lapsed |