Patent US3512840A successfully refreshed from Google Patents.
US3512840A
Expired / Lapsed
US
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Assignee: Individual
•
Filing: 1967-11-24
•
Granted: 1970-05-19
•
Expires: 1987-11-24
Abstract
No abstract record available.
Inventors
- 👤 Edwin E Foster
- 👤 Thomas E Foster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:54
CPC Classifications
B; B60; B60B; B60B7/00; B60B7/06; B60B7/12; Y; Y10; Y10T; Y10T292/00; Y10T292/20; Y10T292/205; Y10T292/212; Y10T292/214
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1362340A
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US1140535A
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US1268550A
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US1954140A
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US2580543A
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US2729510A
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US2902316A
Cited
US2812215A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-05-18 | 1973-11-17 | 1974-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-05-18 | 1977-11-17 | 1978-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-05-18 | 1981-11-17 | 1982-05-19 | $7700.00 | Window Closed / Lapsed |