Patent US2987138A successfully refreshed from Google Patents.
US2987138A
Expired / Lapsed
US
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Combined air filter and tempering device
Assignee: Rockwell-Standard Corp
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Filing: 1958-03-20
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Granted: 1961-06-06
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Expires: 1978-03-20
Abstract
No abstract record available.
Inventors
- 👤 George M Walton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:02
CPC Classifications
F; F02; F02M; F02M35/00; F02M35/02; F02M35/04; F02M31/00; F02M31/02; F02M31/04; F02M31/06; F02M31/07; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1221956A
Cited
US2058204A
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US2365299A
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US2788086A
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US2781032A
Cited
US2763251A
Cited
GB787534A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-05 | 1964-12-05 | 1965-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-05 | 1968-12-05 | 1969-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-05 | 1972-12-05 | 1973-06-06 | $7700.00 | Window Closed / Lapsed |