Patent US4062564A successfully refreshed from Google Patents.
US2969971A
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Reinforced plastic springs
Assignee: 3M Co
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Filing: 1958-07-23
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Granted: 1961-01-31
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Expires: 1978-07-23
Abstract
No abstract record available.
Inventors
- 👤 Donald E Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:02
CPC Classifications
B; B29; B29C; B29C70/00; B29C70/04; B29C70/06; B29C70/10; B29C70/16; B29C70/20; B29C70/202; B07; B07B; B07B1/00; B07B1/46; B29C70/28; B29C70/30; B29C70/34; B29C70/345; B61; B61F; B61F5/00; B61F5/50; B61F5/52; B61F5/523; F; F16; F16F; F16F1/00; F16F1/36; F16F1/362; F16F1/366; F16F1/368; B29L; B29L2031/00; B29L2031/774; Y; Y02; Y02T; Y02T30/00; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1028; Y10T156/103; Y10T156/1034
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-01-31 | 1964-08-01 | 1965-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-01-31 | 1968-08-01 | 1969-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-01-31 | 1972-08-01 | 1973-01-31 | $7700.00 | Window Closed / Lapsed |