US3052997A
Expired / Lapsed
US
⏱️ 0.0 years remaining
True grade apparatus
Assignee: Individual
•
Filing: 1961-07-12
•
Granted: 1962-09-11
•
Expires: 1981-07-12
Abstract
No abstract record available.
Inventors
- 👤 Cyril T Holland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:33
CPC Classifications
E; E02; E02F; E02F3/00; E02F3/04; E02F3/76; E02F3/7636; E02F3/80; E02F3/84; E02F3/841; Y; Y10; Y10S; Y10S37/00; Y10S37/906
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2527840A
Cited
US2622499A
Cited
US2636290A
Cited
US2755721A
Cited
US2792651A
Cited
US2904911A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-09-10 | 1966-03-12 | 1966-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-09-10 | 1970-03-12 | 1970-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-09-10 | 1974-03-12 | 1974-09-11 | $7700.00 | Window Closed / Lapsed |