US3415674A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Impregnation of asbestos-cement products with thermosetting formaldehyde resin
Assignee: International Business Machines Corp
•
Filing: 1965-04-19
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Granted: 1968-12-10
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Expires: 1985-04-19
Abstract
No abstract record available.
Inventors
- 👤 Walter E Voisinet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:47
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B41/45; C04B41/46; C04B41/48; C04B41/4811; C04B41/60; C04B41/61; C04B41/62; C04B41/63; Y; Y10; Y10T; Y10T428/00; Y10T428/27
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) | 1971-12-10 | 1972-06-10 | 1972-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-10 | 1976-06-10 | 1976-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-10 | 1980-06-10 | 1980-12-10 | $7700.00 | Window Closed / Lapsed |