US3450053A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Additive proportioning and injection system
Assignee: DOYLE W MCCULLOCH
•
Filing: 1967-03-10
•
Granted: 1969-06-17
•
Expires: 1987-03-10
Abstract
No abstract record available.
Inventors
- 👤 Doyle W Mcculloch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:10
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/68; C02F1/685; C02F1/686
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US60146A
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US1304330A
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US1702649A
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US2675760A
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GB274380A
Cited
US2118234A
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US3235129A
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US3178888A
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US3359909A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-16 | 1972-12-16 | 1973-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-16 | 1976-12-16 | 1977-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-16 | 1980-12-16 | 1981-06-17 | $7700.00 | Window Closed / Lapsed |