Patent US3438664A successfully refreshed from Google Patents.
US3438664A
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US
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Assignee: USM Corp
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Filing: 1967-11-07
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Granted: 1969-04-15
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Expires: 1987-11-07
Abstract
No abstract record available.
Inventors
- 👤 Engelbert A Meyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:13
CPC Classifications
F; F16; F16B; F16B2/00; F16B2/20; F16B2/22; F16B2/24; F16B2/241; F16B21/00; F16B21/10; F16B21/20; Y; Y10; Y10S; Y10S411/00; Y10S411/918; Y10T; Y10T403/00; Y10T403/70; Y10T403/7062; Y10T403/7064; Y10T403/7066; Y10T403/7075
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2203397A
Cited
US2358890A
Cited
US2353933A
Cited
US2574107A
Cited
US2686687A
Cited
US2895370A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-14 | 1972-10-14 | 1973-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-14 | 1976-10-14 | 1977-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-14 | 1980-10-14 | 1981-04-15 | $7700.00 | Window Closed / Lapsed |