Patent US3520988A successfully refreshed from Google Patents.
US3520988A
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Assignee: RALPH H BALLOCK SR
•
Filing: 1968-07-10
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Granted: 1970-07-21
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Expires: 1988-07-10
Abstract
No abstract record available.
Inventors
- 👤 Ralph H Ballock Sr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:12
CPC Classifications
B; B65; B65H; B65H75/00; B65H75/02; B65H75/04; B65H75/06; B65H75/34; B65H75/36; F; F21; F21V; F21V27/00; H; H02; H02G; H02G11/00; H02G11/02; B65H2701/00; B65H2701/30; B65H2701/34; Y; Y10; Y10T; Y10T24/00; Y10T24/39; Y10T24/3916; Y10T24/3924
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US947111A
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US902406A
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US1383665A
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US2418885A
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US2533341A
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US2823610A
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US3068316A
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US3310623A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-07-20 | 1974-01-19 | 1974-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-20 | 1978-01-19 | 1978-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-20 | 1982-01-19 | 1982-07-21 | $7700.00 | Window Closed / Lapsed |