US3491174A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making integrally colored asbestos-cement products
Assignee: National Gypsum Co
•
Filing: 1966-11-08
•
Granted: 1970-01-20
•
Expires: 1986-11-08
Abstract
No abstract record available.
Inventors
- 👤 Richard B Hamme
- 👤 Robert M Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:55
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/02; C04B2103/00; C04B2103/54; C04B2111/00; C04B2111/54; C04B2111/542
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2058167A
Cited
US2307733A
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US2407514A
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US2818824A
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US2859484A
Cited
US3010940A
Cited
US3219735A
Cited
US3327032A
Cited
US3341396A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-19 | 1973-07-21 | 1974-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-19 | 1977-07-21 | 1978-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-19 | 1981-07-21 | 1982-01-20 | $7700.00 | Window Closed / Lapsed |