US1978369A
Coal drilling apparatus
Abstract
This record has no abstract on file.
Term
Term ended
Expired 23 October 1951, 74.9 years ago.
- Priority and filed
- Granted
- Expired
- Today
Every citation, both ways
| Document | Relation | Office | Cited during |
|---|---|---|---|
| US2003110646A1 | Cited by | United States of America | Pre-grant |
| US2010095537A1 | Cited by | United States of America | Pre-grant |
| US8640346B2 | Cited by | United States of America | Applicant |
| US7204026B2 | Cited by | United States of America | Applicant |
| US2006117579A1 | Cited by | United States of America | Pre-grant |
| US7191526B2 | Cited by | United States of America | Applicant |
| US7497152B2 | Cited by | United States of America | Applicant |
| US7308764B2 | Cited by | United States of America | Applicant |
| US2750714A | Cited by | United States of America | Search report |
| US8061043B2 | Cited by | United States of America | Applicant |
| US2004148789A1 | Cited by | United States of America | Pre-grant |
| US2003101600A1 | Cited by | United States of America | Pre-grant |
| US6912790B2 | Cited by | United States of America | Applicant |
| US5533581A | Cited by | United States of America | Search report |
Numbers
- Application
- 313882
Titles
- English
- Coal drilling apparatus
Classification
- CPC, 1
- E21D9/006
- IPC, 2
- E21B7 02
- E21D9 00