US2921474A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sprinklers
Assignee: LR Nelson Manufacturing Co Inc
•
Filing: 1958-01-13
•
Granted: 1960-01-19
•
Expires: 1978-01-13
Abstract
No abstract record available.
Inventors
- 👤 Walter W Ballard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 02:38
CPC Classifications
B; B05; B05B; B05B3/00; B05B3/02; B05B3/04; B05B3/0417; B05B3/0432; B05B3/0438; F; F16; F16H; F16H21/00; F16H21/10; F16H21/40; F16H21/42; Y; Y10; Y10T; Y10T74/00; Y10T74/18; Y10T74/18056; Y10T74/18184
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1696385A
Cited
US2205664A
Cited
US2426603A
Cited
US2576765A
Cited
US2546241A
Cited
US2717777A
Cited
US2838956A
Cited
US2808292A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-18 | 1963-07-20 | 1964-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-18 | 1967-07-20 | 1968-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-18 | 1971-07-20 | 1972-01-19 | $7700.00 | Window Closed / Lapsed |