Patent US2975481A successfully refreshed from Google Patents.
US2975481A
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Assignee: DENBO ENGINEERING AND SALES CO
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Filing: 1956-08-10
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Granted: 1961-03-21
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Expires: 1976-08-10
Abstract
No abstract record available.
Inventors
- 👤 Robert D Kauffman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 02:42
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/17; B29C45/26; B29L; B29L2031/00; B29L2031/08; B29L2031/087; Y; Y10; Y10S; Y10S425/00; Y10S425/812
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US853334A
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GB284680A
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US2347773A
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US2378586A
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US2396406A
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US2399117A
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US2541923A
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US2485421A
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US2554499A
Cited
US2652190A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-03-20 | 1964-09-19 | 1965-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-20 | 1968-09-19 | 1969-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-20 | 1972-09-19 | 1973-03-21 | $7700.00 | Window Closed / Lapsed |