US3472681A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protective coated asbestos cement panels
Assignee: Pennwalt Corp
•
Filing: 1966-07-28
•
Granted: 1969-10-14
•
Expires: 1986-07-28
Abstract
No abstract record available.
Inventors
- 👤 Ludwig K Schuster
- 👤 Alfonso L Baldi Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:40
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B41/45; C04B41/50; C04B41/5025; C04B41/5033; C04B41/60; C04B41/61; C04B41/65; C04B2111/00; C04B2111/00474; C04B2111/00482; C04B2111/00525; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31652
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2114692A
Cited
US2372284A
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GB759801A
Cited
US3011988A
Cited
US3128546A
Cited
US3094435A
Cited
US3318716A
Cited
US3346522A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-13 | 1973-04-14 | 1973-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-13 | 1977-04-14 | 1977-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-13 | 1981-04-14 | 1981-10-14 | $7700.00 | Window Closed / Lapsed |