US3520407A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Classification method and apparatus
Assignee: Individual
•
Filing: 1967-08-29
•
Granted: 1970-07-14
•
Expires: 1987-08-29
Abstract
No abstract record available.
Inventors
- 👤 Hans Rumpf
- 👤 Kurt Leschonski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:53
CPC Classifications
B; B07; B07B; B07B4/00; B07B4/02; B07B4/025
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US234724A
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US459267A
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US1358375A
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US1877861A
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US1888372A
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US2577295A
Cited
GB798885A
Cited
US2865504A
Cited
US3378140A
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US3311234A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-07-13 | 1974-01-12 | 1974-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-13 | 1978-01-12 | 1978-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-13 | 1982-01-12 | 1982-07-14 | $7700.00 | Window Closed / Lapsed |