Patent US3397782A successfully refreshed from Google Patents.
US3397782A
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US
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Assignee: RAYMOND L KWONG
•
Filing: 1966-01-19
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Granted: 1968-08-20
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Expires: 1986-01-19
Abstract
No abstract record available.
Inventors
- 👤 Chao C Kwong
- 👤 Raymond L Kwong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:05
CPC Classifications
B; B03; B03B; B03B4/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US306822A
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US409025A
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US781722A
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US1133721A
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US1171058A
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US1435382A
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US2265707A
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US2792910A
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US2890081A
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FR1226122A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-08-20 | 1972-02-19 | 1972-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-20 | 1976-02-19 | 1976-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-20 | 1980-02-19 | 1980-08-20 | $7700.00 | Window Closed / Lapsed |