Patent US3444689A successfully refreshed from Google Patents.
US3444689A
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US
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Differential pressure compensator control
Assignee: Weatherhead Co
•
Filing: 1967-02-02
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Granted: 1969-05-20
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Expires: 1987-02-02
Abstract
No abstract record available.
Inventors
- 👤 Tadeusz Budzich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:23
CPC Classifications
F; F15; F15B; F15B11/00; F15B11/02; F15B11/04; F15B11/05; F04; F04B; F04B49/00; F04B49/08; F15B2211/00; F15B2211/20; F15B2211/205; F15B2211/2053; F15B2211/20546; F15B2211/20553; F15B2211/25; F15B2211/253; F15B2211/60; F15B2211/605; F15B2211/6051; F15B2211/6052; F15B2211/6058; F15B2211/70; F15B2211/705; F15B2211/7051; F15B2211/7052; F15B2211/7053; F15B2211/71
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2009608A
Cited
US2238061A
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US2238063A
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US2915985A
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US2892312A
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US3208396A
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US3272135A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-05-19 | 1972-11-18 | 1973-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-19 | 1976-11-18 | 1977-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-19 | 1980-11-18 | 1981-05-20 | $7700.00 | Window Closed / Lapsed |