Patent US1918770A successfully refreshed from Google Patents.
Patent US3503555A successfully refreshed from Google Patents.
US3503555A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lawn sprinklers
Assignee: Ris Irrigation Systems
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Filing: 1967-09-20
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Granted: 1970-03-31
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Expires: 1987-09-20
Abstract
No abstract record available.
Inventors
- 👤 George H Lockwood
- 👤 William Gordon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:00
CPC Classifications
B; B05; B05B; B05B15/00; B05B15/70; B05B15/72; B05B15/74
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US894898A
Cited
US2607624A
Cited
US3268173A
Cited
US3334817A
Cited
US3383047A
Cited
US3331292A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-03-30 | 1973-09-29 | 1974-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-03-30 | 1977-09-29 | 1978-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-03-30 | 1981-09-29 | 1982-03-31 | $7700.00 | Window Closed / Lapsed |