Patent US3426948A successfully refreshed from Google Patents.
US3426948A
Expired / Lapsed
US
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Foam actuator
Assignee: PITTSBURGH RAILWAYS CO
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Filing: 1967-03-01
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Granted: 1969-02-11
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Expires: 1987-03-01
Abstract
No abstract record available.
Inventors
- 👤 Loren D Stirling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:16
CPC Classifications
B; B65; B65D; B65D83/00; B65D83/14; B65D83/28; B65D83/285; B65D83/16; B65D83/20; B65D83/204; B65D2215/00; B65D2215/04
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) | 1972-02-11 | 1972-08-12 | 1973-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-11 | 1976-08-12 | 1977-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-11 | 1980-08-12 | 1981-02-11 | $7700.00 | Window Closed / Lapsed |