Patent US3456959A successfully refreshed from Google Patents.
US3456959A
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Assignee: BILLY J HENDERSON
•
Filing: 1967-11-22
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Granted: 1969-07-22
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Expires: 1987-11-22
Abstract
No abstract record available.
Inventors
- 👤 Thomas E Hemphill
- 👤 Billy J Henderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:06
CPC Classifications
B; B62; B62B; B62B5/00; B62B5/04; B62B1/00; B62B1/18; B62B1/20; B62B5/0438; B62B1/10; B62B1/12; B62B5/0476
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2416492A
Cited
US2715030A
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US2803469A
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US2918296A
Cited
US2992834A
Cited
US3236537A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-07-21 | 1973-01-20 | 1973-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-07-21 | 1977-01-20 | 1977-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-07-21 | 1981-01-20 | 1981-07-22 | $7700.00 | Window Closed / Lapsed |