US3529455A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Key recording device
Assignee: DONALD V HARTZELL
•
Filing: 1968-06-17
•
Granted: 1970-09-22
•
Expires: 1988-06-17
Abstract
No abstract record available.
Inventors
- 👤 Donald V Hartzell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:50
CPC Classifications
B; B67; B67D; B67D7/00; B67D7/06; B67D7/08; B67D7/10; B67D7/103; Y; Y10; Y10T; Y10T70/00; Y10T70/70; Y10T70/7441; Y10T70/7486; Y10T70/7508; Y10T70/7537; Y10T70/7542; Y10T70/7548; Y10T70/778; Y10T70/7791; Y10T70/7842; Y10T70/7847; Y10T70/7853; Y10T70/7915; Y10T70/7932; Y10T70/7938; Y10T70/80; Y10T70/8027; Y10T70/8054
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US494340A
Cited
US797598A
Cited
US1037531A
Cited
US1358921A
Cited
US1376405A
Cited
US1826615A
Cited
US2196194A
Cited
US3237436A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-09-21 | 1974-03-23 | 1974-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-09-21 | 1978-03-23 | 1978-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-09-21 | 1982-03-23 | 1982-09-22 | $7700.00 | Window Closed / Lapsed |