US3531832A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drafting roll clearer and buffer
Assignee: ALVIN C WHITEHEAD
•
Filing: 1968-10-23
•
Granted: 1970-10-06
•
Expires: 1988-10-23
Abstract
No abstract record available.
Inventors
- 👤 Richard K Whitehead Sr
- 👤 Otis B Alston
- 👤 Richard K Whitehead Jr
- 👤 Harry C Whitehead
- 👤 Alvin C Whitehead
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:09
CPC Classifications
D; D01; D01H; D01H5/00; D01H5/18; D01H5/60; D01H5/62
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE664665C
Cited
US2191366A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-10-05 | 1974-04-06 | 1974-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-05 | 1978-04-06 | 1978-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-05 | 1982-04-06 | 1982-10-06 | $7700.00 | Window Closed / Lapsed |