Rudolfs Patent

Rudolfs Patent is less a brand than a stamp. No documents survive tying it to a firm, a founder, or a registration beyond the handful of pipes that carry it, so this entry is limited to what those surviving examples themselves show. Collectors discuss the stamp mainly because its layout and mouthpiece design closely echo a far better-known maker of the period, Peterson.

Appearance of the Stamp

The name is struck across the shank in an arched curve, with the word PATENT set directly beneath it at the center of that arc. The drawing of the initial R is closely related to the shape of the P in Peterson stamps. Taken together, the placement, letter proportions, and word order clearly follow an established pattern of the period. One known example also carries PRIMA beneath the name. PRIMA is a grade stamp also used on Comoy's of London pipes, but Comoy's dating guides place that stamp in the second half of the 1910s, so no overlapping period has been established between the two marks. Their appearing together on the same pipe may point to an exchange of stems or stamps among English workshops, but on its own it proves no production link.

Dating

The only solid basis for a date is a silver band. One known example's band carries the anchor city mark of the Birmingham Assay Office along with the letter that corresponds to 1909 in that office's annual letter cycle. Because the year letter in English hallmarking changes every year, this pins the year the silver was hallmarked to within a single year. Only one pipe is known to offer this evidence, however, so 1909 marks the age of that particular example rather than the whole period during which the stamp was used. Examples lacking a stamp or a band offer no such basis, leaving only a rough estimate from the form of the stamp itself. For the general place of hallmarks in dating, see the entry on pipe patents and registration records.

The Mouthpiece and the Patent Question

The word "patent" in the name is thought most likely to refer to the mouthpiece, since that is where the genuinely original element lies. The tip of the mouthpiece resembles Peterson's P-lip shape: a flattened tip that directs smoke toward the roof of the mouth. Here, however, instead of Peterson's single hole there is a broader flat surface with two separate draft channels. A similar tip design appears on the system pipes made by BBB under the name Glokar; the Glokar patent is reported to have been taken out in 1905, though that date has not been confirmed by any independent registration record. The order in which these three designs emerged, and which registrations they rested on, has never been documented. The patent number, filing date, and rights holder behind the Rudolfs stamp remain unknown today, and the entry should be read with that gap in mind until a new document or catalogue page comes to light.