Patent US3474953A successfully refreshed from Google Patents.
US3474953A
Expired / Lapsed
US
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Vacuum creating device
Assignee: AIR VAC ENG Co Inc
•
Filing: 1969-03-05
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Granted: 1969-10-28
•
Expires: 1989-03-05
Abstract
No abstract record available.
Inventors
- 👤 Raymond A Duhaime
- 👤 Clifford S Lasto
- 👤 Stephen W Lasto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:07
CPC Classifications
F; F04; F04F; F04F5/00; F04F5/44; F04F5/46
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2223242A
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US2382391A
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US2631774A
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US2595737A
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US2909127A
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US3031127A
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US3175515A
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US3291051A
Cited
US3283728A
Cited
US3369735A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-27 | 1973-04-28 | 1973-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-27 | 1977-04-28 | 1977-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-27 | 1981-04-28 | 1981-10-28 | $7700.00 | Window Closed / Lapsed |