US3439664A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Masonry cutter
Assignee: RONALD R SYLVESTER
•
Filing: 1967-03-08
•
Granted: 1969-04-22
•
Expires: 1987-03-08
Abstract
No abstract record available.
Inventors
- 👤 Ronald R Sylvester
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:35
CPC Classifications
B; B28; B28D; B28D1/00; B28D1/22; B28D1/222; B28D1/223; B28D7/00; B28D7/04; Y; Y10; Y10T; Y10T225/00; Y10T225/30; Y10T225/371
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) | 1972-04-21 | 1972-10-21 | 1973-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-21 | 1976-10-21 | 1977-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-21 | 1980-10-21 | 1981-04-22 | $7700.00 | Window Closed / Lapsed |